QJ71C24 RS-485 Communication

[Guest VIC]

HELLO!! I have a question About the Mitsubishi PLC Q type QJ71C24 and my machine communication problem Now my machine communication is MODBUS RTU_MODE Have any body can teach me how to write the communication program (gppw) or give me the demo program thank you very much ^^

[maccxim 0]

I'm not sure but i think QJ71C24/N is not compatible with Modbus protocol. Only the old AnS serie series have a C24-S2 Modbus protocol compatible (slave module). May be possible in the future Mitsubishi will sell a new model of QJ71C24 bye Max

[Guest IanJ]

Hi, We use Mits serial modules and our own custom protocol. I can't offhand see any problem with implementing your own MODBUS protocol rather than expecting the module to support it directly itself. Just a thought. Ian.