rhombus DR20 Door Reader User Manual
- June 13, 2024
- Rhombus
Table of Contents
rhombus DR20 Door Reader
DR20 Door Reader
The DR20 Door Reader is a modern, touchless, and reliable smart reader that
allows users to quickly access spaces using a card, mobile app, or wave-to-
unlock gestures.
Included in the Box:
- DR20 Door Reader x3
- Mounting Bracket x1
- Wall Screws x3
- Torx Key x1
System Overview
The DR20 Door Reader provides a convenient and secure way to access spaces.
It can be easily installed and operated by trained personnel. Please follow
the instructions carefully to avoid any damage to the DR20 or other connected
components.
Mounting Instructions
- To install the DR20, pre-drill pilot holes into the desired mounting surface according to the provided mounting specifications (see Appendix). If using wall anchors, use a 3/16 pilot hole.
- Remove the mounting bracket from the reader by unscrewing the T6 screw located at the bottom of the device.
- Fasten the mounting bracket to the surface using the included wall screws. Make sure that the arrow symbol on the bracket is pointing up.
- After completing the wiring, pass the DR20 cables through the hole and slide the reader into the mounting bracket. Ensure that the tab at the top of the mounting bracket is inserted into the top slot of the DR20.
- While holding the DR20 in place, insert and tighten the T6 screw back into the bottom of the bracket using the provided torx key.
Recommended Wiring
Refer to the provided wiring diagram in the Appendix for the recommended
wiring instructions.
Operation
The DR20 Door Reader is designed to provide touchless access to spaces.
Users can use a card, mobile app, or wave-to-unlock gestures to unlock doors.
Please refer to the user manual for detailed instructions on how to use the
DR20.
Registration
To register the DR20 Door Reader, please follow the registration
instructions provided in the user manual.
Specifications
The specifications of the DR20 Door Reader are listed below:
- Date of Revision: 9/22/2023 A
- Notes: Initial Release
- Radiation Exposure Statement: This equipment complies with Canada’s radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20cm between the radiator and your body.
- Industry Canada Statement: This device contains license-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s license-exempt RSS(s). Operation is subject to the following two conditions: (1) This device may not cause interference (2) This device must accept any interference, including interference that may cause undesired operation of the device.
Troubleshooting
If you encounter any issues with the DR20 Door Reader, please refer to the
troubleshooting section in the user manual for assistance.
Appendix Additional information, including mounting specifications and wiring diagrams, can be found in the Appendix section of the user manual.
**DR20 Overview
**
Quickly access your spaces by card, mobile app, or wave-to-unlock gestures with the DR20 Door Reader — a modern, touchless, and reliable smart reader.
Included in the box:
- DR20 Door Reader
- (2) Wall anchors
- (2) #8 FH wall screws
- (2) 8-32 outlet box screws
- (1) T6 Torx Key
- (1) Extra T6 security screw
Tools You’ll Need:
- Phillips #2 screwdriver
- Pen or pencil for marking drill locations
- Power drill and 1/4” drill bit for wall anchors or 1/8” drill bit for screw pilot 1
- 1-3/8” Hole Saw
Mounting the DR20
- STEP 1
- To install, pre-drill pilot holes into the desired mounting surface in accordance with the mounting specifications provided (see Appendix). Note that a 3/16” pilot hole is required if using the wall anchors.
- STEP 2
- Remove the mounting bracket from the reader by unscrewing the T6 screw at the bottom of the device.
- Fasten the mounting bracket to the surface using the included wall screws and ensure that the arrow symbol on the bracket is pointing up.
- STEP 3
- After wiring is completed, pass the DR20 cables through the hole and slide the reader into the mounting bracket.
- Ensure that the tab at the top of the mounting bracket is inserted into the top slot of the DR20.
- STEP 4
- While holding the DR20 in place, insert and tighten the T6 screw back into the bottom of the bracket using the torx key provided.
Recommended Wiring
Wiring methods used shall be in accordance with the National Electrical Code,
ANSI/NFPA 70. All wiring of the DR20 should be performed prior to connecting
power. Power should be removed before attempting to service the DR20 or any of
its connected devices.
WARNING : Failure to remove power prior to servicing the DR20 may result in damage to connected devices.
Wire Type and Size
| Wire Type| Twisted
Pair
| Shielded| Size| Length
---|---|---|---|---|---
Reader Power| Solid or Stranded| —| Yes| 18 AWG| 300 ft
Reader Data (RS-485)| Solid or Stranded| Yes| Yes| 24 AWG| 300 ft
DR20 is compatible with the Rhombus DC20 Door Controller and communicates
using OSDP protocol over RS-485. Connect the [A], [B] and [GND] lines of the
DR20 to the corresponding terminals in the DC20. 
Power to the reader can be supplied directly by the 12VDC power supply in the
“WIEGAND” section of the DC20 Door Controller. Alternatively, an external
power supply can be used. Note that DR20 requires 8-28VDC with a maximum power
of 4.8W. Refer to Recommended Wire Type and Size table above for more wiring
detail. 
Operation
Proximity Sensor
The DR20 proximity sensor allows for touch-free access using Bluetooth if set-
up on the mobile app.
Accepted Credentials
DR20 is compatible with most NFC card types including mobile NFC for iPhone(R)
and Android(R) devices. DR20 also facilitates Touchless Entry with your mobile
device’s Bluetooth, Location, and other onboard services.
Offline Mode
During a network disconnection, Access Control functionality will be
preserved, however, user grants and schedules cannot be updated. Once the
network connection has been restored to the controller, all alerts, movements,
and access control configurations will be updated automatically.
Registration
Getting Started
To get started, scan the QR code provided with the DR20 or visit
www.rhombus.com/setup/dr20
Specifications
- General Dimensions: Mullion 50 mm x 130 mm x 20 mm [1.97 in x 5.12 in x 0.79 in]
- Weight : 0.31kg (0.7lbs)
- Mounting : Wood/drywall screws Included
Credential
- Frequency : 13.56 MHz
- Credential Compatibility : Rhombus Badge, ISO 14443A (CSN), Rhombus Key app
Connectivity/Power
- Controller Compatibility: DC20
- Input Voltage: 8-28VDC
- Power Consumption MAX: 4.5W
Environmental
- Operating Temperature: -40˚C to 50˚C [-40˚F to 122˚F]
- Operating Humidity: 10%-90% RH
- Weather Resistance: IP65
FCC, UL 294, CE, RCM, AUS and NZ Compliant
Troubleshooting
Power Cycling
If the DR20 needs to be power cycled, remove the reader from the mounting
bracket and unplug the device from the power source. Leave unplugged for
around 30 seconds before reconnecting.
LED Indicators
- The DR20 LED will fade from white to “OFF” when initially connecting.
- The LED will fade from red to white when the RS485 connection is down or if the reader is not connected to an Access Control Unit (ACU).
- The LED will spin white when awaiting authorization. It will momentarily turn green if access is granted or red if authorization is denied.
See the appendix for a complete list of DR20 LED Ring patterns.
Appendix
Mounting Dimensions
DR20 LED Ring Patterns
| Color Pattern | Feedback Name | Feedback Description |
|---|---|---|
| White/OFF fade | Starting Up | Initial connection period, not yet fully |
available.
Blue/OFF fade| Unregistered| –
Red/White fade| ERR: No ACU| RS485 connection is down.
Red/Yellow flash| ERR: Internal| Try again.
Dim white, steady| Await intent| –
Spinning White| Awaiting authorization| –
Solid Green| Unlocked| –
Single Red Flash| Authorization rejected| –
Single Blue/OFF fade| Doorbell pressed| –
Date| Revision| Notes
---|---|---
9/22/2023| A| Initial Release
Service and installation should only be performed by trained personnel.
WARNING: Messages will be fully boxed as shown here. Failing to follow instructions may result in damage to the DR20 or other connected components.
Federal Communication Commission Interference Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions
- This device may not cause harmful interference, and
- This device must accept any interference received, including interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital device, under Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used by the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and the receiver.
- Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
FCC Caution:
Any changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate this equipment. This
transmitter must not be co-located or operating in conjunction with any other
antenna or transmitter.
Radiation Exposure Statement:
This equipment complies with Canada’s radiation exposure limits set forth
for an uncontrolled environment. This equipment should be installed and
operated with a minimum distance of 20cm between the radiator & your body.
Industry Canada statement:
This device contains license-exempt transmitter(s)/receiver(s) that comply
with Innovation, Science, and Economic Development Canada’s license-exempt
RSS(s). Operation is subject to the following two conditions:
- This device may not cause interference
- This device must accept any interference, including interference that may cause undesired operation of the device
Radiation Exposure Statement:
This equipment complies with Canada’s radiation exposure limits set forth
for an uncontrolled environment. This equipment should be installed and
operated with a minimum distance of 20cm between the radiator & your body.