Modbus Gateway(Pro) Technical Service Manual
19
2.2 Communication Debugging with BMS System Equipment
Protocol interface: Modbus RTU Protocol
Hardware interface: RS485
Baud rate: 9600
Starting bit: 1
Data bit: 8
Parity bit: without
Stopping bit: 10
For BMS communication protocol, please make application from Gree Electric Appliances, Inc.
of Zhuhai.
Start
BMS system device sends request frame to Modbus
Gateway(Pro) which complies with standard Modbus
protocol regulation
485-1 RX/TX light of Modbus Gateway(Pro) is blinking
Communication between Modbus Gateway(Pro)
and BMS system device is normal
End
Yes
No
CAN light of Modbus Gateway(Pro) is
blinking; communication with air
conditioner is normal
Malfunction
treatment 2
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