i have made-up a modbus rtu protocol in my PLC,and i used my computer to read back the data from the com A but it keeps missing the 1st address data and therefore the crc is wrong,so i am just wondering if anyone have an example of the modbus rtu settings on cx-protocol for my reference...thx

 

Yes, I have, and I had made Modbus on CJ1M. Write
me on my mail [email protected] and I reply you with the Modbus Protocol master & slave developped by OMRON.
bye

 

which is the pin-out of the wire you use for comunicate the CJ1 and the modbus device?