Project OverWatch initially created for GUVNL R&D Department to Monitor Modbus 3-phase meters over LoRaWAN (IN865). Hardware is developed under KiCAD5. Firmware was written under CoIDE.

• Universal Input Voltage ( 85VAC - 265VAC )
• Input surge Voltage protection ( 2000V )
• Modbus Galvenic Isolation ( 2500V )
• U.fl Antenna / SMA Antenna / PCB Antenna ( 3dbi* )
• Protocol : RS422 / RS485 ( 500kbps )
• Internal Battery / Charger
• Reduced Power Consumption

1. Add the AT command, the command list is shown below;

2. Modify the time of sending data, and modify it to send a packet of data for 60s;

3. Integrate all frequency bands, support band switching, and switch frequency bands by AT command;

   AT command list:
   at+region=EU868/US915/AS923/AU915/IN865/KR920 // Set device region

   at+dev_eui=xxxxxxxxxxxxxxxx // Set device dev_eui
   at+app_eui=xxxxxxxxxxxxxxxx // Set device app_eui
   at+app_key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx // Set device app_key

   at+dev_addr=xxxxxxxx // Set device dev_addr
   at+nwks_key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx // Set device nwks_key
   at+apps_key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx // Set device apps_key

   at+join_mode=otaa/abp // Set the device to join otaa or abp \

   (Note:Please set the region first, then set the join method.)
   After the parameter setting is completed, reset the device enable parameter.

• Reduce Power Consumption (Currently ~45mA ).
  • For this Add mosfet to Modbus transreciver.
• Add Switch for Device Function as Maseter/Slave.
• Protection Devices such as MOV and Fuse(@Mains side).

• programming of Device over RS485(Modbus).
  • Settings of LoRaWAN Parameters.
  • Settings of Modbus Registers.
  • Settings of Alarm for Alert.