GT200 series general purpose inverter instruction manual
Annex Communication Protocol
Networking Method
RS485
Master is
PLC
M200
GT210
Master is PLC
GT210
Single master
multiple slaves
Single master
multiple slaves
Or
RS485
485 conversion
module
ED3100
GT210
485 conversion
module
Master is PC
Inverter Networking Diagram
Interfacing method
RS485: Asynchronous, half duplex Default: 8-N-2, 9600bps.See group FB description
for parameter settings.
Communication method
1. Communication protocol of the inverter is the Modbus protocol, except for supporting
common register read and write, partial commands are also expanded to carry out
management on inverter function codes.
2. The inverter is the slave, master-slave point to point communication. When the master
sends commands using broadcast address, the slave will not respond.
3. During multi-machine communication or long distance communication, connecting a
resistance of 120Ω at both ends of the communication could improve the communication’s
interference rejection.
Protocol format
Modbus protocol supports both RTU mode and ASCII mode, and corresponding frame
format is as follows:
Modbus data frame
RTU mode
Start, at least 3.5
characters idle
Slave
address
Function
code
Data
Check
End, at least 3.5
characters idle
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