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I have serious problem in networking. My Existing system (DATA-Concentrator- Microsol Make) works on RS-422 (4 Wire)Modbus RTU. I want to connect one MODICON Quantum PLC on same cable from DCS. I change RS-422 to RS-232 & RS-232 to RS-485 (2 wire) so I can now multidrop. Again I had convert RS-485 to RS-232 for PLC & RS-485 to RS-232 & RS-232 (Cross cable)to RS-422(4 wire) to Data Concentrator. Am using ADAM-4520 Convertor for conversion.
Now Problem starts when I give query to Data Concentrator (Existing system). It is responding in proper way as desired, but when I give query to PLC I am not getting response. Address of both system are diffrent. I check that when I remove RS-422 Link PLC starts responding & on connecting RS-422 link it does not work.
One more observation that on issuing query to PLC my Data concentrator TXDA & RXDA LED blinks & also responds. I had changed address of both systems but same problem persists.
Is it the problem of Half Duplex Full Duplex or 4 wire & 2 wire, Am in saturation stage, waiting for solution from expert what needs to be done.
Please help.
Now Problem starts when I give query to Data Concentrator (Existing system). It is responding in proper way as desired, but when I give query to PLC I am not getting response. Address of both system are diffrent. I check that when I remove RS-422 Link PLC starts responding & on connecting RS-422 link it does not work.
One more observation that on issuing query to PLC my Data concentrator TXDA & RXDA LED blinks & also responds. I had changed address of both systems but same problem persists.
Is it the problem of Half Duplex Full Duplex or 4 wire & 2 wire, Am in saturation stage, waiting for solution from expert what needs to be done.
Please help.