Troutman16 Posted June 8, 2017 Report Share Posted June 8, 2017 I have a M91 Unitronics PLC (M91-T4-R6-ZK1 serial HB21006HN4002G) which has a RJ-11 port for RS-232 Modbus communication. I have a GE PLC which has a RJ-45 port for RS-232 communication with following pin readout: 1.RTS 2.TxD 3.RxD 4. 5.Com 6.CTS 7. 8.Com Is a adapter kit required? Quote Link to comment Share on other sites More sharing options...
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