11n Mesh Card for Delta Smart Grid Network Instruction Manual

11n Mesh Card for Delta Smart Grid Network

Introduction

The Mesh Card is designed to interface with the Smart Electricity Meter as an AddOn Board Communication Module to enable the wireless data transfer capability for the Smart meter and also act as a wireless mesh network which is implemented under Wi-Fi 802.11a/b/g/n standard. It has been designed to operate in dual-band Wi-Fi connectivity which supports IEEE 802.11a/b/g/n standard. The whole solution is implemented with the Texas Instruments AM437x (SoC) Applications processor and WiFi Module WL1837 from TI is used which supports Dual band 2.4GHz/5GHz Wi-Fi.

Hardware Specifications

Processor and
Wi-Fi module|

• Processor: AM4378BZDN80 from Texas Instruments
• Wi-Fi Module: WL1837MODGI from Texas Instruments

Memory|

• DDR3 SDRAM – 128MBytes
• NAND Flash – 256MBytes

Wi-Fi|

• Dual-band IEEE802.11a/b/g/n
• Wi-Fi Radio Either 2×2 on 2.4GHz
  • (or) lx1 on 2.4GHz
  • (or) lx1 on 5GHz
• Wi-Fi Mesh and Wi-Fi hotspot simultaneous operation

Power Supply|

• In stand alone mode, Board can be powered by 12V

DC(1A Current) or 4V DC(2A Current) Supply.

Operating
Temperature| -40°C to 85°C

IC marking of Mesh card

Top view of the Mesh card

• The top side of the Mesh Card contains the Main Processor AM437XZDN, Wi-Fi Module WLAN/BT Module WL1837MODGI, DDR3, and PMIC.

Bottom View of Mesh Card

The Bottom Side of the Mesh Card contains the IO connector (PCB Ref Des J5) used to provide a supply to the board and communicate with the meter over UART serial interface.

Mesh Card Power Supply Connection

The Mesh card needs to be powered with the 4V supply from a Standard bench power supply using the cable assembly with DC Jack which should be connected to the IO Connector J5 on the board as shown in the above image.

Note : The Red wire is for 4V and Black wire is for GND.

Step 1: Connect the male header to the respective female header(J5) in the board.

• Red color wire (4V supply pin) – PIN: 4 of J5
• Black color wire (Ground pin) – PIN: 6 of J5

Note : J5 Header is present on the bottom side of the board.

Step 2:  Connect the 2 wires Red and Black from the Mesh card’s J5 connector using the male jumper to the Power supply.

Note : Mesh Card be powered on using either with 12V or 4V supply. When 11n Mesh card is installed in the Vision Meter, the mesh card will be powered from 4V supply

Pin No 2 — 12V
Pin No 6 — GND
2| 4V Input| J5 Connector:
Pin No 4 — 4V
Pin No 6 — GND

LED Indication for Power ON/OFF status of Mesh Card

Note : The LED D16 will glow when Mesh Card is Power ON include one photo with meter as a final configuration

Antenna Port – U.FL Connector

The 11n Mesh card supports WiFi 2.4GHz and 5GHz Radios. The dual band patch antenna is used and needs to be connected with the on-board U.FL connectors highlighted in the above image.

S.No| PCB Ref Des| Frequency (GHz)| Patch Antenna Part Number
---|---|---|---
1| J2| 2.4GHz| W3334B0150
2| J4| 5GHz| W3334B0150

UART TO USB Connection for Console

NOTE: This U2UC console board is only for accessing console logs for testing purposes and this board will not be provided with the final product.

Connecting Mesh Card UART signals into U2UC Board

The above image shows the connection of UART to the USB conversion board for accessing console logs. The Tx, Rx and GND pin needs to be connected to the respected marked circles in the H7 connector of the U2UC board.
Step 1: The UART signals are taken from the Test points of the Mesh card as follow,

Step 2: The wires from the Mesh cards are connected to the UART to USB console board in header H4 as follows

• Step 3: Short the 2nd and 3rd pin of H7 in UART to USB Console board
• Step 4: From the J1 connector connect the USB type B cable and connect the other end of the cable to the PC for the console.

Console Using Tera Term Software

• Steps to be followed after connecting the USB cable to your PC is given below,

STEP 1

• After connecting the U2UC windows board to PC as mentioned in the Section 6 above, in the windows PC goto Start and open Open Tera Term.

STEP 2

• Please ensure that the Serial option is selected. Then Select the serial the COM Port:
• USB Serial Port is detected, then press OK.

STEP 3

• Open Setup and select Serial port

STEP 4

• After clicking the serial port, select the speed as 115200 and then Click the new setting.

STEP 5
Please check for the console logs. Once the Mesh Card has booted up, below login credentials need to be provided to proceed further.

• Login : root
• Password : delta123

Note

• Passwords will not be displayed in the console log screen, so please enter the correct password and press enter to proceed further.
• The design of the product complies with U.S. Federal Communications Commission (FCC) guidelines respecting safety levels of radio frequency (RF) exposure for Mobile devices.

RF Radiation Exposure Statement: This equipment complies with FCC RF radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 20 centimeters between the radiator and your body.

FCC PART 15 STATEMENT

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

1. this device may not cause harmful interference.
2. this device must accept any interference received, including interference that may cause undesired operation.

This equipment has been verified to comply with the limits for a class B computing device, pursuant to FCC Rules. In order to maintain compliance with FCC regulations,
shielded cables must be used with this equipment. Operation with non-approved equipment or unshielded cables is likely to result in interference to radio and TV reception. The user is cautioned that changes and modifications made to the equipment without the approval of the manufacturer could void the user’s authority to operate this equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. See 47 CFR Sec. 15.105(b). 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 in accordance with 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 or more 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 ID: 2A3WGOA70110

FCC CAUTION STATEMENT FOR MODIFICATIONS

CAUTION : Any changes or modifications not expressly approved by Delta Energy and Communication, Inc. could void the user’s authority to operate the equipment

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