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+--- Thread: N. 4 MODBUS DEVICES ON A RTU (/showthread.php?tid=4968)
N. 4 MODBUS DEVICES ON A RTU - gdimaria - 15.09.2023
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
RE: N. 4 MODBUS DEVICES ON A RTU - admin - 15.09.2023
Do you have GND connected between all devices? How many registers are mapped? What is the exact error that you are getting when writing?
RE: N. 4 MODBUS DEVICES ON A RTU - gdimaria - 15.09.2023
Each device mapped about fifty registers.
However I solved by lowering the speed to 9600.
Thank you