Error: Modbus RTU - session 1 not found


Thread Starter

Nair Barrionuevo

Dear friends,

I resort again to you for support in the following consultation. With a protocol analyzer inside of the RTU Master R211 (ABB) via MODBUS communication leaves the following error message:

11:01:35.372: ...> COM1 01 03 10 04 00 01 c1 0b
11:01:35.372:**** Error: Modbus RTU - session 1 not found ****

and with other protocol analyzer:

X: Modbus function code 3 (0x03) - Read Output Registers
Remote address 1 (0x01)
Could not match response to previous query

So that is it, and how can I can solve it?

I will thank you much for your commentaries.