N. 4 MODBUS DEVICES ON A RTU

[gdimaria]

Hi, I have 4 modbus devices on RTU 1 (19600 , parity even).

If I add a single device and map it (no matter if the first, second, etc.)  I can read and write on its registers.

if I have more than a single device mapped on the RTU, I can't write anymore...

the cabling should be ok, any idea about the cause?

Thanks

Peppe

[admin]

Do you have GND connected between all devices? How many registers are mapped? What is the exact error that you are getting when writing?

[gdimaria]

Each device mapped about fifty registers.

However I solved by lowering the speed to 9600.

Thank you