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I am trying to get communication from a idec HG1X-452 display to a Twido PLC using a RS232 expansion module on the Twido. I have all comm. parameters set correctly. The hg1x pinouts are labeled txd, rxd, 5vdc from PLC, grnd, and dir. Twido pinouts are rts, dtr, txd, rxd, dsr, gnd. I have tried several pin configs with no success. I also have used the Modbus tester program from my PC to the Twido and it does work. Any help will be appreciated.
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