Modbus RTU Communication Error

[KevinVt]

Hello Mikhail,

I had set up a test communication line of Modbus RTU, it connect good, but always get Error belows:
————————————————————-
2023-05-25 17:55:25 Session with the device [3] ModbusRTU_T1
Request element group “TestDevice1”
Send (8): 01 03 00 00 00 02 C4 0B
Receive (0/2):
Error: communication failed
Request element group “TestDevice1”
Send (8): 01 03 00 00 00 02 C4 0B
Receive (0/2):
Error: communication failed
Request element group “TestDevice1”
Send (8): 01 03 00 00 00 02 C4 0B
Receive (0/2):
Error: communication failed
——————————————-
I am sure the send data to modbus master is good, and the logs of modbus master is correct as below:
——————————————–
18:00:23.56 Request from Client – Functioncode: 3 ; Starting Address: 0 Quantity : 2
18:00:23.56 Response To Client – Functioncode: 3 ; Bytecount: 4 ; Send values: 8 6
——————————————–

Dear Mikhail, could you please help me to identify what’s the problems?

Thanks.

[KevinVt]

Dear Mikhail,

I got the solution of this question, default value of Timeout and Delay in RTU device are 0, it’s OK when set Timeout to 1000 and Delay to 200.

Thanks.

[Mikhail]

Hello,
Glad the problem got resolved.

[Author]

Posts