legrand PX-Series PDU Rack Power Distribution Units

Specifications

• Product Models: PX2, PX3, PXO, PXC
• Mounting Options: Zero U, 1U, 2U
• Addressing: APIPA and Link-Local

Before You Begin

Make sure to unpack the product and components carefully. Prepare the installation site by checking the branch circuit rating and filling out the equipment setup worksheet.

Rackmount Installation

Follow these steps to rack-mount the PDU:

1. Rack-Mounting the PDU: Secure the PDU in the rack using appropriate hardware.
2. Mounting Zero U Models: Choose between L-Brackets, Button Mount, Claw-Foot Brackets, or Two Rear Buttons based on your model.
3. Mounting 1U or 2U Models: Secure the PDU in the rack according to the mounting instructions provided.

Frequently Asked Questions

Q: Can I use the PDU with different branch circuit ratings?
A: It is recommended to match the branch circuit rating with the PDU specifications to ensure safe operation.

Q: How do I configure the PDU’s addressing settings?
A: The PDU supports APIPA and Link-Local addressing, refer to the user manual for instructions on configuring these settings.

Q: What are the package contents of the PDU?
A: The package typically includes the PDU unit, mounting hardware, and any required cables or documentation.

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Introduction to Xerus Technology Platform PDUs PX-Series User Guide

Raritan’s data center power products include rack power distribution units (rack PDUs), inline meters, transfer switches, and branch circuit monitoring systems. Leveraging Xerus Technology Platform, all Raritan power distribution products improve uptime and availability by making power management devices easier to deploy, control, and manage remotely across multiple locations. Natively compatible with DCIM software, Raritan power distribution products allow you to easily scale new environmental monitoring and access control devices as well as gather actionable insights for quicker, smarter decision making.

The PX Intelligent Rack PDU series provides reliable power distribution for IT equipment cabinets. It offers metering at the inlet, outlet, and PDU circuit breaker level. Support for 120 to 400V: single or three-phase. Form factors from Zero to 3U. Plus environmental monitoring support.

The PX Inline Meter series (PX3-3000 series) is a simple way to add power and environment monitoring to other vendors’ basic PDUs. It also monitors standalone IT equipment. Simply wire or plug the inline meter into existing circuits. See real-time power data and check for hot spots.

This User Guide/Online Help covers all Raritan PX-Series Xerus PDUs and inline meters except for the newest, PX4 PDU.
· PX3 · PX2 · PXC · PXO

Differences Between Models

· All Xerus Technology Platform features that are supported on PX Series PDUs are documented here. Not all models support all features. Unique differences between models are documented with the
specific product name.

Product models

PX2

PX3

PXC / PXO

Front panel display

LED display

Dot-matrix LCD display

Dot-matrix LCD display

Outlet latching relays

Number of LAN ports

1

2

2

Maximum LAN rate

100 Mbps **

1,000 Mbps

100 Mbps

13

Product models

PX2

Replaceable controller

Number of USB-A ports

1

Maximum USB rate

12 Mbps

RS-232 port (CONSOLE/MODEM)

Male DB9 Connector

Expansion ports

SENSOR port type

RJ-12

PX3

PXC / PXO

2

1

480 Mbps

480 Mbps

RJ-45 Connector

RJ-45 Connector

**** RJ-45

RJ-45

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PX Series comparison in brief:

Features

Inlet power measurement

1000 Series

Outlet power measurement

Safety Guidelines
WARNING! Before installing or operating this product, read and understand all sections in this guide.
WARNING! Connect this product to an AC power source with a voltage that is within the range specified on the product’s nameplate. Operating this product outside the nameplate voltage range may result in electric shock, fire, personal injury and death.
WARNING! Connect this product to an AC power source that is current limited by a suitably rated fuse or circuit breaker in accordance with national and local electrical codes. Operating this product without proper current limiting may result in electric shock, fire, personal injury and death.
WARNING! Connect this product to a protective earth ground. Never use a “ground lift adaptor” between the product’s plug and the wall receptacle. Failure to connect to a protective earth ground may result in electric shock, fire, personal injury and death.
WARNING! This product contains no user serviceable parts. Do not open, alter or disassemble this product. All servicing must be performed by qualified personnel. Disconnect power before servicing this product. Failure to comply with this warning may result in electric shock, personal injury and death.
WARNING! Use this product in a dry location. Failure to use this product in a dry location may result in electric shock, personal injury and death.
WARNING! Do not rely on this product’s receptacle lamps, receptacle relay switches or any other receptacle power on/off indicator to determine whether power is being supplied to a receptacle. Unplug a device connected to this product before performing repair, maintenance or service on the device. Failure to unplug a device before servicing it may result in electric shock, fire, personal injury and death.
WARNING! Only use this product to power information technology equipment that has a UL/IEC 62368-1 or equivalent rating. Attempting to power non-rated devices may result in electric shock, fire, personal injury and death.
WARNING! Do not use a product containing outlet relays to power large inductive loads such as motors or compressors. Attempting to power a large inductive load may result in damage to the relay.
WARNING! Do not use this product to power critical patient care equipment, fire or smoke alarm systems. Use of this product to power such equipment may result in personal injury and death.

WARNING! If this product is a model that requires the assembly of the line cord or plug, the assembly must be performed by a licensed electrician, and the line cord or plugs used must be rated based on the product’s nameplate ratings, as well as national and local electrical codes. Assembly by unlicensed electricians or failure to use suitably rated line cords or plugs may result in electric shock, fire, personal injury or death.
WARNING! This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.

Package Contents
The following sub-topics describe the equipment and other material included in a typical product package.
Zero U Products
· One PX-Series PDU · Screws, brackets and/or buttons for Zero U
1U Products
· One PX-Series PDU · 1U bracket pack and screws · Cable retention clips for the inlet (for some models only)
2U Products
· One PX-Series PDU · 2U bracket pack and screws · Cable retention clips for the inlet (for some models only)
APIPA and Link-Local Addressing
PX-Series PDU supports Automatic Private Internet Protocol Addressing (APIPA).
With APIPA, your PX-Series PDU automatically configures a link-local IP address and a link-local host name when it cannot obtain a valid IP address from any DHCP server in the TCP/IP network. Only IT devices connected to the same subnet can access the PX-Series PDU using the link-local address/host name. Those in a different subnet cannot access it.
Exception: Port Forwarding mode does not support APIPA.
Once the PX-Series PDU can get a DHCP-assigned IP address, it stops using APIPA and the link-local address is replaced by the DHCP-assigned address.

Scenarios where APIPA applies:
· DHCP is enabled on the PX-Series PDU, but no IP address is assigned to the PX-Series PDU. This may be caused by the absence or malfunction of DHCP servers in the network. For example, connecting the PXSeries PDU to a computer using a network cable.

· The PX-Series PDU previously obtained an IP address from the DHCP server, but the lease of this IP address has expired, and the lease cannot be renewed, or no new IP address is available.
Link-local addressing:
· IPv4 address: Factory default is to enable IPv4 only. The linklocal IPv4 address is 169.254.x.x/16, which ranges between 169.254.1.0 and 169.254.254.255.
· IPv6 address: A link-local IPv6 address is available only after IPv6 is enabled on the PX-Series PDU. See Configuring Network Settings.
· Host name – pdu.local: You can type https://pdu.local to access the PX- Series PDU instead of typing the linklocal IP address.
Retrieval of the link-local address:
· See Device Info.
Before You Begin
Before beginning the installation, perform the following activities:
· Unpack the product and components · Prepare the installation site · Check the branch circuit rating · Fill out the equipment setup worksheet
Unpacking the Product and Components
1. Remove the product and other equipment from the box in which they were shipped. 2. Compare the serial number of the equipment with the number on the packing slip located on the outside
of the box and make sure they match. 3. Inspect the equipment carefully. If any of the equipment is damaged or missing, contact Technical Support
for assistance. 4. Verify that all circuit breakers on the product are set to ON. If not, turn them ON. Or make sure that all fuses are inserted and seated properly. If there are any fuse covers, ensure that they are closed.
Note: Not all models have overcurrent protectors.

Preparing the Installation Site
1. Make sure the installation area is clean and free of extreme temperatures and humidity.
Note: Check the product specification sheet for the maximum operating temperature for your model.
2. Allow sufficient space around the product for cabling and outlet connections. 3. Review Safety Instructions listed in this guide.
Checking the Branch Circuit Rating
The rating of the branch circuit supplying power to the product shall be in accordance with national and local electrical codes.
Filling Out the Equipment Setup Worksheet
An Equipment Setup Worksheet is provided in this guide. Use this worksheet to record the model, serial number, and use of each IT device connected.
As you add and remove devices, keep the worksheet up-to-date.

Rackmounts
In This Chapter
Rack-Mounting the PDU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 PXO Rackmount Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Connecting a PX3 Locking Line Cord. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Installing Cable Retention Clips on the Inlet (Optional). . . . . . . . . . . . . . . . . . . . . . 32 Installing Cable Retention Clips on Outlets (Optional). . . . . . . . . . . . . . . . . . . . . . . 33 SecureLockTM Outlets and Cords. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Button-Type Locking Outlets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Circuit Breaker Orientation Limitation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Rack-Mounting the PDU
This section contains the most common rackmount methods. Follow the procedure suitable for your model.
Rackmount Safety Guidelines
· Operating temperature in a closed rack environment may be greater than room temperature. Do not exceed the rated maximum ambient temperature of the Power Distribution Units. See Specifications (on page 583) in the User Guide.
· Ensure sufficient airflow through the rack environment. · Mount equipment in the rack carefully to avoid uneven mechanical loading. · Connect equipment to the supply circuit carefully to avoid overloading circuits. · Ground all equipment properly, especially supply connections, to the branch circuit.

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Mounting Zero U Models Using L-Brackets
To mount Zero U models using L-brackets:
1. Align the baseplates on the rear of the device. 2. Secure the baseplates in place. Use the included L-shaped hex key to loosen the hex socket screws
until the baseplate is “slightly” fastened. 22

3. Align the L-brackets with the baseplates so that the five screw-holes on the baseplates line up through the L-bracket’s slots. The rackmount side of brackets should face either the left or right side of the device.
4. Fasten the brackets in place with at least three screws (one through each slot). Use additional screws as desired.
5. Using rack screws, fasten the device to the rack through the L-brackets.
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Mounting Zero U Models Using Button Mount
To mount Zero-U models using button mount:
1. Align the baseplates on the rear of the device. Leave at least 24 inches between the baseplates for stability.
2. Make the baseplates grasp the device lightly. Use the included L-shaped hex key to loosen the hex socket screws until the baseplate is “slightly” fastened.
3. Screw each mounting button in the center of each baseplate. The recommended torque for the button is 1.96 N·m (20 kgf·cm).
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4. Align the large mounting buttons with the mounting holes in the cabinet, fixing one in place and adjusting the other.
5. Loosen the hex socket screws until the mounting buttons are secured in their position. 6. Ensure that both buttons can engage their mounting holes simultaneously. 7. Press the device forward, pushing the mounting buttons through the mounting holes, then letting
the device drop about 5/8″. This secures the device in place and completes the installation.
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Mounting Zero U Models Using Claw-Foot Brackets
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To mount Zero U models using claw-foot brackets:
1. Align the baseplates on the rear of the device. 2. Secure the baseplates in place. Use the included L-shaped hex key to loosen the hex socket screws
until the baseplate is “slightly” fastened. 3. Align the clawfoot brackets with the baseplates so that the five screw-holes on the baseplates line
up through the bracket’s slots. The rackmount side of brackets should face either the left or right side of the device. 4. Fasten the brackets in place with at least three screws (one through each slot). Use additional screws as desired.
5. Using rack screws, fasten the device to the rack through the clawfoot brackets.
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Mounting Zero U Models Using Two Rear Buttons
To mount Zero U models using two buttons:
1. Turn to the rear of the hardware. 2. Locate two screw holes on the rear panel: one near the bottom and the other near the top (the side
of cable gland). 3. Screw a button in the screw hole near the bottom. The recommended torque for the button is 1.96
N·m (20 kgf·cm). 28

4. Screw a button in the screw hole near the top. The recommended torque for the button is 1.96 N·m (20 kgf·cm).
5. Ensure that the two buttons can engage their mounting holes in the rack or cabinet simultaneously. 6. Press the device forward, pushing the mounting buttons through the mounting holes, then letting
the device drop slightly. This secures the device in place and completes the installation.
Mounting 1U or 2U Models
Using the appropriate brackets and tools, fasten the 1U or 2U device to the rack or cabinet.
To mount the 1U/2U device:
1. Attach a rackmount bracket to both sides of the device with the provided screws.
2. Insert the cable-support bar into rackmount brackets.
3. Secure with the provided end cap screws.
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4. Fasten the rackmount brackets’ ears to the rack using your own fasteners.
PXO Rackmount Method
You can place PXO in any appropriate location with or without fastening it. To fasten it, screw up fasteners to screw holes on two sides of PXO.
Connecting a PX3 Locking Line Cord
PX3 PDUs are shipped with either of the following locking line cords. · A line cord with locking clips: A locking inlet on the PDU is required for this cord. · A line cord with slide release buttons: This line cord automatically locks after being connected to the
inlet. A locking inlet is not required for this cord. A locking inlet and/or locking line cord ensure that the line cord is securely fastened to the inlet.
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To connect a cord with locking clips:
Make sure the line cord’s locking clips fit into the locking holes at two sides of the inlet when plugging the cord’s connector into the PDU’s locking inlet.

Number 1 2

Item Locking holes on the inlet Locking clips of the line cord

To connect a cord with slide release buttons:
Plug the cord’s connector into the PDU’s inlet.

Number 1

Item Slide release buttons

Disconnecting a PX3 Locking Line Cord
The ways to disconnect a locking line cord vary according to the cord type.
To disconnect a line cord with locking clips:
Press both locking clips of the line cord while unplugging the cord.

Tip: You can slightly move the line cord’s plug horizontally while pulling it out to facilitate the disconnection process.

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To disconnect a line cord with slide release buttons:
Push both slide release buttons toward the cord while unplugging this cord.
Installing Cable Retention Clips on the Inlet (Optional)
If your device is designed to use a cable retention clip, install the clip before connecting a power cord. A cable retention clip prevents the connected power cord from coming loose or falling off. The use of cable retention clips is highly recommended for regions with high seismic activities, and environments where shocks and vibrations are expected.
To install and use a cable retention clip on the inlet:
1. Locate two tiny holes adjacent to the inlet. 2. Install the cable retention clip by inserting two ends of the clip into the tiny holes.
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Zero U models

1U/2U models

3. Connect the power cord to the inlet, and press the clip toward the power cord until it holds the cord firmly.

Zero U models

1U/2U models

Installing Cable Retention Clips on Outlets (Optional)
If your device is designed to use a cable retention clip, install the clip before connecting a power cord. A cable retention clip prevents the connected power cord from coming loose or falling off. The use of cable retention clips is highly recommended for regions with high seismic activities, and environments where shocks and vibrations are expected. These optional clips come in various sizes to accommodate diverse power cords used on IT equipment, which are connected to C13 or C19 outlets. You can request a cable retention kit containing different sizes of clips from your reseller. Make sure you use a clip that fits the power cord snugly to facilitate the installation or removal operation (for servicing).
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To install and use a cable retention clip on the outlet:
1. Locate two tiny holes at two sides of an outlet. 2. Install the cable retention clip by inserting two ends of the clip into the tiny holes.
3. Plug the power cord into the outlet, and press the clip toward the power cord until it holds the cord firmly. The clip’s central part holding the plug should face downwards toward the ground, like an inverted “U”. This allows gravity to keep the clip in place.
4. Repeat the same steps to install clips and power cords on the other outlets.
SecureLockTM Outlets and Cords
SecureLock securely holds C14 or C20 plugs in place. This method requires the following two components: · PDU with SecureLockTM outlets, which have a latch slot inside either side of the outlet. · SecureLockTM cords, which is a power cord with a locking latch on each side of its plug.
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Item A

Description Latches on the SecureLockTM cord’s plug

If your PDU does not have this design, do NOT use the SecureLockTM cords with it. The SecureLockTM outlets can accept regular power cords for power distribution but the SecureLockTM mechanism does not take effect.

To lock a power cord using the SecureLockTM mechanism:

1. Verify that the SecureLockTM cord you purchased meets your needs.
· The cords’ socket matches the power socket type (C14 or C20) on your IT equipment. · The cord’s plug matches the outlet type (C13 or C19) on your PDU. 2. Connect the SecureLockTM cord between the IT equipment and your PDU.
· Push the plug toward the outlet until you hear the click, which indicates the plug’s latches are snapped into the latch slots of the outlet.

To remove a SecureLockTM power cord from the PDU:

1. Press and hold down the two latches on the cord’s plug as illustrated in the diagram below, then unplug the cord.

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Button-Type Locking Outlets
Such outlets do not require any special power cords to achieve the locking purpose. Plug a regular power cord into the locking outlet and the outlet automatically locks the cord.
To remove a power cord from the locking outlet:
1. Press and hold down the tiny button adjacent to the outlet, then unplug. Depending on the outlet type, the button location differs.
Circuit Breaker Orientation Limitation
Usually a PDU can be mounted in any orientation. However, when mounting a PDU with circuit breakers, you must follow these rules: · Circuit breakers CANNOT face down. For example, do not horizontally mount a Zero U PDU with
circuit breakers facing up or down.
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Initial Installation and Configuration
This chapter explains how to install your device and configure network connectivity.
In This Chapter
Connecting the PDU to a Power Source. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Connecting to Your Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Configuring the PX-Series PDU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Bulk Configuration Methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Cascading for Shared Ethernet Connectivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Power-Sharing Restrictions and Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Connecting the PDU to a Power Source
1. Verify that all circuit breakers on the PDU are set to ON. If not, turn them ON. Or make sure that all fuses are inserted and seated properly. If there are any fuse covers, ensure that they are closed.
Note: Not all models have overcurrent protectors.
2. Connect each PDU to an appropriately rated branch circuit. Refer to the label or nameplate for appropriate input ratings or range of ratings.
3. When the software has completed loading, the front panel display illuminates.
Connecting to Your Network
To remotely administer the PX-Series PDU, you must connect it to your local area network (LAN). Wired or wireless networks are supported. Ethernet port is enabled by default. Port layouts, labels, speeds, and number of Ethernet ports vary by model.
To make a wired connection:
1. Connect a standard network patch cable to one or both Ethernet ports on the PDU. · If the two Ethernet ports have different speeds, use the higher speed port for network connection.
2. Connect the other end of the cable to your LAN.
Warning: Accidentally plugging an RS-232 RJ-45 connector into the Ethernet port can cause permanent damage(s) to the Ethernet hardware.
To make a wireless connection:
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Do one of the following: · Plug a supported USB wireless LAN adapter into the USBA port on your PDU. · Connect a USB hub to the USB-A port on the PDU. Then plug the supported USB wireless LAN adapter into the appropriate USB port on the hub.
USB Wireless LAN Adapter – DX2-WIFI-KIT
The Legrand DX2-WIFI-KIT is the supported wireless LAN adapter.

Wi-Fi LAN adapter

Supported 802.11 protocols Supported Xerus releases Supported controllers

Legrand DX2-WIFI-KIT AC/A/B/G/N

Release 4.1.0 and later

iX7 and later

Supported Wireless LAN Configuration
If wireless networking is preferred, ensure that the wireless LAN configuration of your PX-Series PDU matches the access point. The following is the wireless LAN configuration that the PX-Series PDU supports.
· Supported 802.11 protocols: AC/A/B/G/N · Protocol: WPA2 (RSN) · Key management: WPA-PSK, or WPA-EAP with PEAP and MSCHAPv2 authentication · Encryption: CCMP (AES) Tips: Supported 802.11 network protocols vary according to the wireless LAN adapter being used.
Dual Ethernet Connection
Models with two Ethernet ports may have ports supporting different speeds. Note if your Ethernet port is marked with speed. Port layouts and labels may vary by model.
· ETH1 or ETH2 marked 10/100/1000 supports up to 1000 Mbps.
Exception: USB-cascading chains have different requirements.
Check list when connecting both ports to the networks:
· Both Ethernet interfaces are connecting to different subnets. · Both Ethernet interfaces have been enabled. By default both are enabled. · Both Ethernet interfaces are configured with proper IPv4 and/or IPv6 settings.
· It is NOT required that the two Ethernet interfaces share similar network settings. For example, you can enable IPv4 settings in one interface but enable IPv6 settings in the other, or apply static IP to one but DHCP IP to the other.
· The cascading mode is disabled. By default it is disabled. Go to Device Settings > Network.

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Configuring the PX-Series PDU
You can initially configure via one of the following: · A TCP/IP network that supports DHCP · A mobile device with PDView installed · A computer physically connected to the PDU Basic configuration process overviews:
Configuration via a DHCP-enabled network:
1. Connect the PX-Series PDU to a DHCP IPv4 network. 2. Use the front panel LCD display to retrieve the IP address. 3. Launch a web browser to configure the PX-Series PDU.
Configuration via a connected mobile device:
1. Download the PDView app to your mobile device. 2. Connect the mobile device to PX-Series PDU via USB. 3. Launch PDView to configure the PX-Series PDU.
Configuration via a connected computer:
1. Connect the PX-Series PDU to a computer. 2. Use the connected computer to configure via the command line or web interface.
· Command line interface: See Initial Network Configuration via CLI. · Web interface: Launch a web browser on the computer, and enter the link-local IP address or
pdu.local.
Connecting a Mobile Device
Raritan’s PDView is a free app that turns your iOS or Android mobile device into a local display for PXSeries PDU. PDView is especially helpful when your PX-Series PDU is not connected to the network but you need to check status, retrieve information, or change settings.
39

Requirements for using PDView:
· If using an Android device, it must support USB “On-The-Go” (OTG). · An appropriate USB cable is required.
Step A: Download and install PDView
1. Visit either Apple App or Google Play Store. · https://itunes.apple.com/app/raritan-pdview/id780382738
· https://play.google.com/store/apps/details?id=com.raritan.android.pdview
2. Install PDView.
Step B: Connect the mobile device to PX-Series PDU
1. Get an appropriate USB cable for your mobile device. · iOS: Use the regular USB cable shipped with your iOS mobile device. · Android: Use a USB OTG adapter cable.
2. Connect the mobile device to the appropriate USB port on the PX-Series PDU. · iOS: USBA port. · Android: USBB port
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Step C: Launch PDView
1. Launch the PDView app from your mobile device. Below illustrate iPad’s PDView screens. a. The “Disconnected” message displays first when PDView has not detected the PX-Series PDU yet. A diagram in PDView indicates the appropriate USB port your mobile device should connect according to your mobile operating system.
Note: PDView also shows the ‘Disconnected’ status during the firmware upgrade. If so, wait until the firmware upgrade finishes. b. The PDView shows the “Connected” message when it detects the connected PX-Series PDU.
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2. If the factory-default login credentials remain unchanged, or if PDView has been configured with accurate login credentials, PDView automatically logs in to the web interface.
If PDView can’t log in automatically, the login screen displays instead and you must enter appropriate user credentials for login. 3. The web interface opens and prompts to change the password if this is the first time login.
Tip: You can store the updated “admin” or other user credentials in PDView so that automatic login always functions properly upon detection of the PX-Series PDU.
Saving User Credentials for PDView’s Automatic Login
When PDView detects PX-Series PDU for the first time, it automatically attempts to log in with the factory-default user credentials.
If you have modified the factory-default user credentials, PDView’s automatic login fails and the login screen displays for you to manually enter user credentials.
To make automatic login work again, you can save the modified admin credentials or any custom user credentials in PDView. A maximum of 5 user credentials can be saved, and PDView will try these credentials one by one until the login succeeds.
The following procedure illustrates iPad only, but the procedure applies to any iOS or Android mobile device.
To save user credentials in PDView:
1. Make sure your mobile device is NOT connected to the PX-Series PDU so that PDView does NOT perform the automatic login feature after it is launched.
2. Launch PDView on your mobile device.
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3. Tap the top-right Settings icon

(iOS) or

(Android).

4. The user credentials setup page opens. · Per default, three administrator user credentials are pre-configured for three Legrand brands: Raritan Legrand Server Technology
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5. Modify existing user credentials or type new ones, and tap Save. The pre- configured admin credentials can be removed or overwritten to meet your needs.
Connecting to a Computer
The PX-Series PDU can be connected to a computer for configuration via one of the following ports. · Ethernet ports · USBB port · RS-232 serial port (RJ45)
Zero U models:
To use the command line interface (CLI) for configuration, establish an RS232 or USB connection.
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To use a web browser for configuration, make a network connection to the computer. The following linklocal addressing is available in any network without DHCP available:
· https://169.254.x.x Use the front panel display to find the address. · https://pdu.local Establish one of the following connections to a computer.
Direct network connection:
1. Connect one end of a standard network patch cable to either Ethernet port of the device. 2. Connect the other end to a computer’s Ethernet port. 3. On the connected computer, launch a web browser to access using either link-local addressing:
pdu.local or 169.254.x.x.
USB connection:
1. A USB-to-serial driver is required in Windows®. Install this driver before connecting the USB cable. 2. Connect a USB cable between a computer’s USBA port and the USBB port of the device. 3. Perform initial network configuration via CLI.
Serial connection for “RJ45” RS232 connector:
1. Connect the RJ45 end of the RJ45-to-DB9 adapter cable to the RJ45 port labeled CONSOLE / MODEM on the device.
2. Connect the DB9 end to your computer’s RS232 port (COM). 3. Perform initial network configuration via CLI.
Initial network configuration via CLI sample:
These sample commands set up the ETH1 interface with static IP address, gateway, and DNS server settings.

config config:# network bridge enabled false config:# network ipv4 interface

ETH1 enabled true config:# network ipv4 interface ETH1 configMethod static config:# network ipv4 interface ETH1 address 192.168.56.80/24 config:# network ipv4 interface ETH1 gateway 192.168.56.128 config:# network dns firstServer 1.1.1.1 secondServer 1.0.0.1 config:# network ethernet Eth1 speed 100Mbps duplexMode full config:# apply
RJ45-to-DB9 Cable Requirements for Computer Connections
For devices with a console port, an RJ45toDB9 adapter/cable is required for connecting the PX-Series PDU to a computer, if the use of a USB cable is not wanted.
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A third party RJ45toDB9 adapter/cable needs to meet the following requirements. · RJ45 to “DB9 female” · RX/TX and according control pins are CROSSED The widespread blue Cisco RJ45 to DB9 adapter cable is highly recommended, which has the following pin assignments:
Note: The blue Cisco RJ45 to DB9 adapter cable CANNOT be used for connecting a modem.
Bulk Configuration Methods
If you have to set up multiple devices, you can use one of the following configuration methods to save time.
A bulk configuration file downloaded from PX-Series PDU:
· Requirement: All devices to configure are of the same model and firmware. · Procedure: First finish configuring one PX-Series PDU. Then download the bulk configuration file
from it and copy this file to all of the other PX-Series PDU devices. See Bulk Configuration (on page 373).
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For the remaining methods, see Special Configuration and Upgrade Methods (on page 595).
A TFTP server:
· Requirement: DHCP is enabled in your network and a TFTP server is available. · Procedure: Prepare special configuration files, which must include fwupdate.cfg, and copy them to
the root directory of the TFTP server. Re-boot all PX-Series PDU devices after connecting them to the network.
Curl command:
· Requirement: Two files are required — one is a configuration file in TXT and the other is a devices list file in CSV. See config.txt and devices.csv.
· Procedure: Upload both files to all of PX-Series PDU devices one by one, using the appropriate curl command.
SCP or PSCP command:
· Requirement: Two files are required — one is a configuration file in TXT and the other is a devices list file in CSV.
· Procedure: Upload both files to all of PX-Series PDU devices one by one, using the appropriate SCP or PSCP command.
A USB flash drive:
· Requirement: A FAT32- or superfloppy-formatted USB flash drive containing two special configuration files and one device list file is required.
· Procedure: Plug this USB drive into the PX-Series PDU. When a happy smiley is shown on the front panel display, press and hold one of the control buttons on the front panel until the display turns blank.
Cascading for Shared Ethernet Connectivity
See the Cascading Solution Guide for full details on network setup, physical setup, and supported configurations for all cascades across products. The sections documented here are a brief overview. See Cascading Solutions for Xerus (on page 639).
You can have multiple devices share one Ethernet connection by cascading them using either the USB interface or Ethernet interface The first one in the cascade is the primary device and all the other devices follow it in the cascade. Only the primary device is physically connected to the LAN — wired or wireless.
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Each device in the cascade is accessible over the network, with Bridging or Port-Forwarding cascading mode activated on each device.
· Bridging: Each device in the cascading chain is accessed with a different IP address. · Port Forwarding: Each device in the cascading chain is accessed with the same IP address(es) but
with a different port number assigned.
Basic cascading restrictions:
· All devices in the chain must run compatible firmware versions of 3.3.10 or later. · The cascading mode of all devices in the chain must be the same. · In the Bridging mode, the primary device can have only one connection to the network. DO NOT
connect both Ethernet ports to the network(s) unless your network has the R/STP protocol enabled.
Note: The Port Forwarding mode does NOT have this restriction. In this mode, you can enable two wired and one wireless network connections.
· Do NOT connect cascaded devices other than primary to the LAN or WLAN. · (WIFI only) You must use Raritan’s USB WIFI wireless LAN adapter instead of other WIFI adapters for
wireless network connection.
Best Practices for Cascading
One Ethernet connection per cabinet is better:
One Ethernet connection per cabinet is better than one Ethernet connection across cabinets because of these advantages:
· More reliable connectivity. · Easier to manage or maintain one cabinet when all of the cabling and connections are located in the
same cabinet. · Reduces the crosscabinet cabling.
When to establish a chain comprising 32 devices:
A chain consisting of 32 devices saves the most Ethernet connections and costs, and it is recommended only when:
· External Ethernet ports are expensive or limited. · Available IP addresses are limited.
Ethernet cascading is recommended for supported devices with Dual Ethernet ports:
If all the devices in the intended cascade have dual Ethernet ports, cascading them via Ethernet is better than via USB. The Ethernet interface offers the following benefits:
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· Longer cabling distance · Lower latency · Connection more reliable with RJ45 connectors
Power-Sharing Restrictions and Connection
Two devices can share power supply to their controllers via a designated port, so that when either controller fails to receive adequate power from its inlet(s), it continues to receive backup power from another device which functions properly and therefore remains accessible to users. For documentation purposes, the term “power-sharing mode” is used to describe the status when the PDU controller is receiving power from another device. Before making a power-sharing connection, first read Power-Sharing Configurations and Restrictions (on page 51), and remove unsupported equipment from BOTH PDUs. After a PDU enters power-sharing mode, some data/operations are no longer available.
Unavailable data or operations in power-sharing mode:
· All outlets lose power, and enter the “disabled” state. · No outlet switching can be performed. · All internal sensors become “unavailable”, including sensors of inlets, outlets, and OCPs.
Exception: Only energy data remains available. · Communications with relay/meter boards are lost. Therefore, firmware upgrade may fail.
Available data or operations in power-sharing mode:
· Change software settings, such as customizing names, modifying network settings, configuring thresholds, and so on.
· Monitor the status of connected environmental sensor packages, or configure/control their settings. · Operate the front panel display.
Events that occur when entering power-sharing mode:
· The power supply sensor enters the fault state.
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Tip: You can set an event rule for sending a notification when this sensor enters the fault state. · The above event is logged in the internal event log.
To check status of power-sharing mode:
· Check the state of the power supply sensor. For SNMP, the sensor type is i1smpsStatus (46).
Power Sharing Port on iX7 Controllers
Two units with iX7 controllers can be connected via their “EXPANSION” ports using standard network cable for power sharing.
Making a Power-Sharing Connection – iX7 Example
Make sure BOTH PX-Series PDU devices comply with the configuration limitations when establishing a power-sharing connection. The supported maximum power- sharing distance is 2 meters.
Make a power-sharing connection:
1. Connect the two PDUs with a standard network patch cable (Cat5e/6) that is up to 2 meters long, using the designated power sharing port for your model.
· Do NOT use a crossover cable. This example shows connection of two iX7 controllers using the EXPANSION port.
· Note that the EXPANSION port location on your PX-Series PDU may differ from the following images.
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Power-Sharing Configurations and Restrictions
When either PDU enters power-sharing mode, BOTH PDUs support “less” external equipment than usual. It is strongly recommended to remove specific equipment from both PDUs when making a power-sharing connection.
Configuration limitations on “both” PDUs:
· Connect the two PDUs with a standard network patch cable (Cat5e/6) that is up to 2 meters long, using the “PDU LINK” port for power sharing.
· NO USB wireless LAN adapter is connected. That is, you have to connect both PDUs to a “wired” network if LAN access is wanted.
· For models that support asset strips: No asset management strips can be connected while power sharing.
· The maximum number of DX2 environmental sensor packages or door handles that can be connected decreases. See Smart Sensor Configurations for Power Sharing.
· After either PDU enters the power-sharing mode, you must NOT physically remove or add any environmental sensor packages to either PDU.
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Supported Sensor Configurations for Power Sharing
All information and restrictions described in this section apply to BOTH PDUs involved in the powersharing configuration, unless otherwise specified.
· NO changes to usual support for DX2, DPX2 and DPX3 sensors in power sharing configurations. · The maximum number of supported DX environmental sensor packages also remains unchanged as
long as the DPX3ENVHUB4 sensor hub is not used — that is, 12 DX sensor packages. However, there are DX restrictions when DPX3ENVHUB4 is used, and there are also door handle-related restrictions.
DX sensor restrictions while DPX3ENVHUB4 is involved:
· A maximum of one DPX3-ENVHUB4 and a maximum of 10 DX sensor packages are supported.
Door handle connection restrictions (via DX2DH2C2 or DXPD2C5):
· (Restriction only for DX2DH2C2 manufactured before 2019) DO NOT connect any “SouthCo H3EM series” door handle(s) because of insufficient power supply in the powersharing mode. Note: The latest generation of DX2DH2C2 does NOT have this restriction and can have SouthCo H3EM series connected in the powersharing mode.
· A maximum of 2 door handles connected to a maximum of one DX2DH2C2 or one DXPD2C5 package are supported.
· All of the 2 door handles must be controlled by the same PDU so that you can have “only one” handle opened at a time to avoid critical power consumption. That is, ALL door handles must be connected to only one PDU in the power- sharing connection, NOT both PDUs. Note: It is strongly suggested to make sure the upper limit of “powered dry contact actuators” is set to 1 when making a power-sharing connection.
Other sensor restrictions when door handles are present:
First make sure the connection of door handles complies with the above restrictions.
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The following restrictions apply only to the PDU that has all the door handles connected. · When there are 2 door handles connected to the PDU (via DX2DH2C2 or DXPD2C5), up to 10
sensor packages of DPX2/DPX3/DX2 or up to 2 additional DX sensor packages can be additionally connected. Raritan’s sensor hubs must NOT be used. · When there is only 1 handle connected, up to 12 sensor packages of DPX2/DPX3/DX2 or up to 3 DX sensor packages can be additionally connected. Sensor hubs must NOT be used.
NO physical changes made to the number of connected sensor packages:
· After either PDU enters the power-sharing mode, you must NOT physically remove or add any environmental sensor packages to BOTH PDUs.
Warning: The inrush current of a newly added sensor package may cause both PDUs to reboot.
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Linking Units
The Linking feature allows the linking configuration of a single Primary unit to multiple link units so that you can view and manage them all in one place. The primary unit has full knowledge of the location of the connected link units, as well as the power and/or environmental information of all link units. The primary unit provides visibility and control both the primary unit and the link units from within the GUI, SNMP, and CLI.
The default password is only tried when connecting two PDUs using their Link ports. If the designated link unit has a different password then the connection will fail. When linking PDUs over any other interface the administrator must specify the link unit’s password.
Communication between primary and link units happen via HTTPS. When establishing the connection the link unit to be added must have HTTPS enabled at the default port 443. For added security, certificates are checked. Link units must have the demo certificate, or if custom certificates are set, the CA certificate must be installed onto the primary unit. (Go to PDU > Link Units page > “TLS Certificate” button.)
All network modes are supported. Network and physical configurations must be completed before configuring Linking.
The administrator privilege is required for all management actions (adding, configuring, releasing) of the Linking feature. Each unit in the chain can be monitored and managed from anywhere by the network protocols HTTP(S), SNMP, SSH, and Telnet.
All units in the linked chain must be the same model. All units must run the same firmware version, which can be upgraded respectively for each unit in the chain.
In This Chapter
FAQs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Linking in the Web Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Displays for Primary and Link Units. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Linking in the CLI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
FAQs
What’s the difference between a “primary unit” and a “link unit”?
Primary and link units are the same model PX-Series PDU that are equal to each other, and each has its own IP address. You designate a PX-Series PDU as the primary unit by logging into it and then adding a link unit. The first unit becomes the primary, and when the first link unit is added, the primary unit is automatically assigned ID “1”, which is reserved to identify a primary unit only, and the ID “1” cannot be edited. A connection between the primary and the link unit has now occurred and the chain is formed.
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As you continue to add link units to the chain as desired (up to seven link units), you select Link ID “2” through “8” for the Link ID numbers. Note that the Link ID “2-8” is the sequential number of each link unit that you select as you add the unit to the chain, and once selected, the Link ID cannot be edited. When the chain is established with a single primary unit, and one or more link units, communication occurs with the primary unit through its IP address. The primary unit, in turn, communicates to the other link units in the chain through their individual IP addresses, which optimizes monitoring and management.
Which models can be linked?
Linking is supported on various products, but all devices in the chain should be the same models, running the same firmware version.
Which network setup modes are supported?
For the underlying network, the Linking feature can use the typical network setup modes: Independent Setup: All units have their own regular IP address. They don’t need to be in a physical chain to be logically chained. You communicate only to the primary using its normal IP address. Configure networking of the units, and then add link units using the Web GUI, CLI, or USB. Bridged Setup: Same as Independent Setup, but the units are physically connected as a chain, either by ethernet or USB. The configuration steps are the same as with Independent Setup. Port Forwarding Cascade: The units are physically connected as a chain (either by Ethernet or USB). Only the first primary unit is connected to your network with the IP address you assigned. The other units will get automatically-assigned private IP addresses. When a Cascading in Port Forwarding mode configuration is detected, you can automatically convert the cascaded units into Link Units using the GUI in the primary unit, or add link units with the other methods in the Web GUI, CLI, or USB.
See Cascading Solutions for Xerus (on page 639).
Can primary units be linked together?
No. Once a unit is designated as the primary unit in a chain, it cannot be linked to a primary unit in another chain. A primary unit can only be linked to one or more link units in a chain.
How many units can be linked?
Including the primary, a full chain can include a total of eight units. The first unit added is designated as the primary unit with the ID “1”. Each unit you then add to the chain is designated as a link unit, beginning with ID “2” and ending with ID “8”.
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What is re-linking?
Re-linking is a required function when a link unit no longer recognizes or responds to the primary unit, most likely caused by the link unit being reset to factory defaults. The status of the disassociated link unit will be displayed as “Access Denied”. Selecting the link unit when in this status displays the Re-link button that allows reconnection of the link unit in the chain for regaining device control. Note: Re-linking uses the same Link Unit ID and hostname, but you will need to reauthenticate with your login credentials.
What user privileges are required for managing the Linking configuration?
Administrative privileges are required for both the primary unit and link unit. To add a link, your administrative login account is required, but after that you only log in to the primary to manage the chain, as all link units in the chain are visible in the user interface from the primary unit view.
What happens if the connection is lost between the primary and link units?
The primary unit’s dashboard displays information about unreachable link units in the Link Unit Failures section.
If the network connection is lost, these link unit functions will still work:

1. Front panel display 2. Energy accumulation and outlet states (not applicable to SRC) and these link unit functions will stop working: 1. Event log entries are lost 2. Event rules, actions and alarms 3. Remote access to the link unit 4. Synchronization of primary settings and time when not using NTP
   Which system areas of the primary and link units are automatically synchronized?
   The primary unit periodically checks link unit reachability. You can define rules to be alerted when communication with a link unit fails, such as a system alarm. Some link unit settings are automatically synchronized with the primary:
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1. Peripheral device settings 2. Front panel privileges and default view 3. USB host port lockdown 4. Time and date settings 5. General data logging settings
How are firmware updates handled?
Uploaded firmware images in the GUI are automatically distributed to all link units at the same time. Starting a firmware update requires the automatic image upload on the link units to be finished first. Firmware version must match between primary units and link units to function normally. If the primary unit is updated before the link units, for example, you will see a “Firmware version mismatch” message in the Link Units section. When this occurs, link unit data will not display. You will not be able to switch to the mismatched link unit. Upon update of the linked unit to the matching firmware version, normal data displays will resume.
Does Linking support mass deployment?
Yes, mass deployment has been extended to support a setup for the Linking feature (multi-IP or singleIP) via the Mass Deployment Utility, which provides the Excel spreadsheet process used for bulk configuration. For information about using the utility, see Configuration or Firmware Upgrade with a USB Drive.
Linking in the Web Interface
The following topics describe how to configure and use Linking in the web interface.
Viewing the Primary Unit
To view and manage Linking, log in to the unit designated as the primary unit, and go to the PDU page. When you add a link unit, a chain is established between the primary and the new link, and the primary becomes ID “1”.
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The PDU page displays the following information about the primary PDU: 1. Firmware version 2. Model 3. Serial number 4. MAC address 5. Rating 6. Link to Data Log The ID of the primary unit is automatically assigned the ID “1”, as shown in the example as “My PDU (1)”. The ID cannot be edited.
Options for Adding Link Units
To start configuring the Primary Unit with Link Units, your options in the web interface depend on the network and physical configuration of units. · If you configured units in Independent or Bridging Mode, where they may or may not be physically
cascaded, and each one is assigned its own IP address, you can manually add each link unit. You can use this manual function anytime to add link units. See Adding a Link Unit (on page 58). · If you configured units in a Port- Forwarding Cascade Mode configuration, in which they are physically cascaded and only the first unit is connected to the network, you can automatically link the cascaded units. See Linking Cascaded Units (on page 60)
Adding a Link Unit
A link unit (up to seven units) can be added to a single primary unit. On the PDU page, the Link Units section will contain all link units. The Add Link Unit button, highlighted in green in the screen example, also displays in the Link Units section.
To add a link unit:
· Primary and link units must be the same model, running the same firmware versions. 1. Log in to the primary unit and go to the PDU page. 2. Click Add Link Unit. The following add box displays:
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3. The Link ID is populated as the next available ID number (2-8), assigned sequentially as each link unit is added to the chain to identify the link unit in the user interfaces. Note: From the drop-down, you can manually select the desired Link ID to order the link units in the chain as desired. Once associated with a link unit, the Link ID cannot be edited.
4. Provide the IP address of the link unit. 5. Provide the login credentials for the link unit. Note: If the link unit has factory settings, you will be
prompted to set the new password. 6. Click Add.
· The link unit’s firmware version is checked to ensure it matches the primary unit. If a mismatch is found, a message appears and the link unit is not added.
7. When the firmware matches, the new link unit is added in a list in the Link Units section. All link units added to the chain are now managed by the single primary unit.
The PDU page displays the following information about the link unit:
· Link ID · Host/IP address · Communication status · Firmware version
About the Link ID
The Link ID “1” is automated and reserved internally for the primary unit. The primary unit’s ID “1” cannot be edited.
The Link ID “2-8” is available for you to select as the ID for each of the link units you add to the chain. From the Link ID drop-down, you can select the desired Link ID to manage the link units in the chain. Once selected, the Link ID cannot be edited.
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Linking Cascaded Units
When units have been configured in a physically-connected cascade in Port Forwarding mode, PX-Series PDU can detect expansion units via the primary unit, and link these cascaded units.
While a cascaded chain supports up to 32 units, and may include different products and different models, Linking can only accommodate a maximum of 8 units linked, and all units must the same models running the same firmware version.
Link units can be added by different methods, so remember that 8 total is the maximum overall.
You can link cascaded units in two ways:
· Link All Cascaded Units (Automatic method): Use this method when your cascade’s 1 through 8 expansion units are same product/model/firmware, and you want that configuration simply and directly converted to Linking. The automatic option will attempt to link all cascaded units, assigning each either a linklocal IPv6 address or node-index-dependent URL as it is discovered and linked. The process begins with the first expansion unit connected to the primary, and proceeds through the cascade in order. The process ends when all 8 Link unit IDs have been filled, or when a link attempt fails.
· Custom: Use this method when you want to selectively add only some expansion units from the cascade, or otherwise customize how expansion units are linked, and in what order. The Custom settings option requires that you to select each cascaded unit by its node number, and map it to a Link ID manually. You must also select a hostname type for each link. The linking process follows your customized list and attempts to add all selected expansion units.
To link all cascaded units (Automatic method):
1. On the PDU page, click the Link Cascaded Units button. The Link Cascaded Units dialog opens. 2. Enter the administrator user name and password assigned to all designated link units. Must be the
same credentials for all units. 3. Select “Link all Cascaded Units” for automatic linking.
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4. Select the Hostname type to be assigned to all link units: · Link-local IPv6 address: Units are assigned IPv6 addresses that are accessible from the primary unit. · Dependent on node index: Units are assigned a URL that includes their node index number, for example “expansion-1.pf-cascade”, “expansion-2.pf-cascade”, “expansion-3.pf-cascade”, where the node number indicates the expansion unit’s position in the chain related to the primary unit.
5. The table shows the process that will run: Node Index indicates the expansion unit number to be linked, Link ID shows the link ID to be assigned, and Hostname shows the hostname type for all, as specified.
6. Click Link to start the linking process. The table shows progress and then final results. In the example below, expansion unit 1 was linked successfully. Expansion unit 2 failed–the connection may have failed, or this result may also indicate there was no unit at that position. Expansion units 3-7 were skipped because the process stops upon first failure.
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To link cascaded units (Custom method):
1. On the PDU page, click the Link Cascaded Units button. The Link Cascaded Units dialog opens. 2. Enter the Primary Unit’s administrator user name and password. 3. Select Custom Settings. 4. Click Append Node to add a row to the table, then complete each field in the row to describe how
the expansion unit should be linked. Repeat this step as needed to create a table of all nodes to link. · Node Index: Select the node index for the expansion unit you want to add. Node index 1 indicates
the first expansion unit connected to the primary unit, then expansion units are numbers sequentially as you go down the cascaded chain. · Link ID: Select the Link ID that this expansion unit will be mapped to once linked. · Hostname: Select the hostname type to be assigned to this link unit. Link- local IPv6 address: Units are assigned IPv6 addresses that are accessible from the primary
unit. Dependent on node index: Units are assigned a URL that includes their node index number, for
example “expansion-1.pf-cascade”, “expansion-2.pf-cascade”, “expansion-3.pf- cascade”, where the node number indicates the expansion unit’s position in the chain related to the primary unit.
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5. The completed table you create shows the process that will run. 6. Click Link to start the linking process. The table shows progress and then final results.
Note: If a unit is removed from a linked cascade, a reset to defaults is necessary to access the unit.
Primary Units Manage Link Units
The primary unit manages the following functions for the entire chain of linked units: 63

· User management and authentication ­ configured only on the primary. · Date and time ­ the primary synchronizes its date and time settings to link units. If NTP is not used,
then the synchronization interval is every 10 minutes. · Device settings ­ only the primary device settings are configurable, except for Network Settings.
Some settings will be synced to link units. The serial port is configurable for the primary only; link units use the console. · Data model settings ­ such as outlet names, thresholds, peripherals, etc., are configured on the primary and stored on link units. Features vary by model. · Lua scripts ­ Communication with link units in a Lua script is possible.
Releasing a Link Unit
Releasing a link unit means the unit is separated from the chain and the unit then becomes standalone. The primary unit no longer has access to the released link unit.
To release a link unit from the Primary Unit’s web interface:
Note: If a release action is attempted on a link unit when the unit is an unreachable state, a warning message displays, and the primary will not recognize the link unit. 1. From the PDU page, in the Link Units section, click a link unit to select it. 2. Click Release Link Unit. 3. A confirmation prompts to cancel or release. If released, the link unit is removed from the page.
To release a link unit directly:
Caution: Should be used only in a emergency situation. If you navigate to a link unit directly, in a web browser, a Release Link option is available instead of a login option. · Enter the username and password, then click Release Device.
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Switching to a Different Unit
Switching your view to a different unit is a control function noted by the Switch control in the upper left corner of the pages that display primary and link unit information.
Displayed data in the GUI defaults to the primary unit. The Switch control allows you to switch from a primary page to a link unit page, and back again to the primary.

To switch to a different unit:

1. Click the Switch

control.

2. Select one of the link units from the drop-down list. Link number “2-8” appears in parentheses.

3. The page displays data for the selected link unit.

4. To return to the page for the primary, select the primary unit. Primary number “1” appears in parentheses.

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Configure load shedding on linked units
You can switch between units in the GUI and setup / activate load shedding separately for every link unit. Activating load shedding on the primary unit will not activate load shedding for the whole cascade.
Re-linking a Link Unit
Re-link is a required function when a link unit no longer recognizes or responds to the primary unit, most likely caused when the link unit has been reset to factory defaults. Resetting to factory defaults causes the linked unit in the chain to be unreachable, and it would have to be removed from the chain manually. If reset to factory defaults, the status of the disassociated link unit will be displayed as “Access Denied”, shown below.
To re-link a link unit:
1. When you select the link unit in the “Access Denied” status, the Re-link button displays, as noted above.
2. To reconnect the link unit in the chain, and to regain full control of the unit, click Re-Link Unit. 3. Although re-linking uses the same Link Unit ID and hostname of the unreachable unit, you will need
to reauthenticate with your login credentials. 4. Click the Re-link button. 5. The status of the link unit changes to “OK”.
Viewing Link Unit Information
When a link unit is added to the chain, the primary unit view (through the GUI) allows full access to the operational data of the link unit. For example, using the navigation tabs of the GUI, link unit data is displayed in several pages: the Dashboard, PDUs, Inlets, Outlets, Outlet Groups, Peripherals, and Feature Ports.
Dashboard
The Dashboard shows inlets, OCPs, alerted sensors, and inlet history for the entire linked chain. In this example, data for the single inlet of the primary “My PDU (1)” Inlet I1, and the inlet of the link unit “My PDU (2)” Inlet I1, are displayed together. The OCPs for the units are also available together on the Dashboard page.
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Peripheral sensors are not shown on the dashboard by default. Only sensors (both PDU or peripheral) in warned or critical state are displayed in the Alerted Sensors section.
PDU Page
The PDU page displays the details and settings for the selected unit (primary or link). The Link PDUs section is only shown when the primary unit is selected.
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Inlets Page
On the Inlets page, the primary unit and link units are displayed together on the same page. In this example, data for the single inlet of the primary “My PDU (1)” Inlet I1, and the inlet of the link unit “My PDU (2)” Inlet I1, are shown together on the Inlets page.
Outlets Page
The Outlets page defaults to display only the outlets of the primary unit, in this example 30 outlets.
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Viewing Outlets for Link Units
On the Outlets page, you can switch from the primary to the link. 1. From the Outlets page drop-down, select the link unit “My PDU (2)”. Note: To view outlets for a
specific link unit, the link unit must be selected by name.
All outlets of the link unit display for viewing and access exactly like the outlets of the primary unit.
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2. You can switch back to the primary unit by selecting “My PDU (1)”. Note: The Switch control is only available when there is at least one link unit in the chain; otherwise, the page defaults to displaying only the outlets of the primary. 3. From the Outlets page (either primary or link), select an outlet in the list to view operational details
for the specific outlet and to configure outlet settings.
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Outlet Groups
An outlet group is a named collection of selected outlets. When user-defined, an outlet group can contain outlets from different PDUs, including both primary and link units.
Outlet groups support fast and efficient outlet control actions (On, Off, Power Cycle) across multiple PDUs, and with PDU Linking, member outlets for the primary and its link units can be collected in the same outlet group.
Outlet groups are managed by the primary unit, and multiple outlet groups can be controlled simultaneously. Summary and power energy readings are available per outlet group.
The Outlet Groups page displays current user-defined outlet groups along with name, outlet state, active power reading, and the page also shows the outlet labels that were selected for the group. Note in the Outlets column in this example that outlets from both primary and link units display together within a named group. This is an example of outlet “pairwise”, a function described in more detail later in this next section.
Note: Outlet groups can contain multiple pairs of outlets; the next screen example shows only two outlet pairs in the sample groups.

Click the control arrow group number.

to toggle the outlet group list in ascending or descending order by

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Viewing Outlet Group Details
Click an outlet group name in the list to display operations details for the outlet group. From this page, you can issue the outlet control actions On, Off, and Cycle (power cycling to restore the outlet) for all member outlets in the outlet group. The page also allows editing of the outlet group members and its outlet settings.
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To add an outlet group:
1. On the Outlet Groups page, click Add Group. The New Outlet Group page displays, defaulting to the outlets in the primary unit.
2. Type a name for the new outlet group. 3. Select individual member outlets for the primary as shown in the default page, or to select all
outlets for the primary, select My PDU (1). 4. To select individual member outlets for the link unit My PDU (2), click Add Outlets. To select all
outlets for the link unit, select My PDU (2). Note: Link units have to be selected by name to display their outlets. 5. Click Save.
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The following example shows the outlet group named “TEST 1” with all outlet members selected for the primary unit and outlet members 1-6 selected for the link unit.
Controlling Outlets in Groups
1. From the Outlet Groups page, select an outlet group by name. 2. Click the desired control: On, Off, or Cycle. This example shows three outlets in status On. When Off
is clicked, a prompt appears to confirm applying the action to all outlets in the group. 3. Click the Switch button.
4. The status of the outlets in the group appears on the Outlets Group page as Off.
Pairwise Outlet Groups
The PDU Linking feature offers the “pairwise” functionality for outlet grouping. Pairwise creates autonamed pairs of outlet groups that span multiple PDUs (primary and link units) using the same outlet label. You can automatically create multiple outlet groups, each containing one pair of outlets between linked PDUs that can be controlled as an outlet group.
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Example: Chain with primary and a single link unit

PDU 1 (Primary Unit)

Server Load

PDU 2 (Link Unit)

Outlet 1

Server 1

Outlet 1

Outlet 2

Server 2

Outlet 2

Outlet 3

Server 3

Outlet 3

…

…

…

Outlet 20

Server 20

Outlet 20

Using the above example, to control power to a server, you would typically switch one outlet of PDU 1 and one outlet of PDU 2. With pairwise, you can auto-create an outlet group named “Outlet pair 3”, and the new group will automatically contain Outlet 3 from PDU 1 (primary) and Outlet 3 from PDU 2 (link).

Automatically Create Pairwise Outlet Groups
1. From the Outlet Groups page, from the drop-down menu

select Automatic Creation.

2. Confirm the pairwise creation.

3. Pairwise outlet groups are created and named automatically for all outlets on the primary and link unit, such as “Outlet pair 1”, “Outlet pair 2”, “Outlet pair 3”, etc.
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OCPs Page
Overcurrent protectors from both primary and link PDUs are displayed together on the same OCPs page. If sensors are present on the units, sensor data for both primary and link units will also appear on the page.
Peripherals Page
The Peripherals Page shows peripheral devices connected to the primary or link unit.
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Asset Strips Page
The Asset Strips page shows all rack unit information from both the primary and link units.
Displays for Primary and Link Units
Each unit in a PDU Linking chain displays its own PDU data (inlets, outlets, sensors, alerts, etc.)
Primary unit:
From the following example of the primary unit display, navigate the options for displaying Link PDU identification and status, and to confirm the primary unit tha

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