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...
MVP 2023 Joe Tauser Posted June 12, 2017 MVP 2023 Report Share Posted June 12, 2017 You're going to have to make a cable, but it should work. On the Unitronics side- 3 - TX 4 - RX 5 - COM (0V) Search the Help for "RS232" and choose the RS232 topic for a picture. Cross TX and RX in your cable: GE M91 2 4 3 2 5 5 Joe T. Quote Link to comment Share on other sites More sharing options...
Troutman16 Posted June 12, 2017 Author Report Share Posted June 12, 2017 Thanks for the reply. Sounds like I can use a RJ11 (phone) cable and add a RJ-45 connector or vice versa. Did you mean (see underline) GE M91 2 4 3 3 5 5 I was looking for the picture you mentioned and could not find the RS232 topic. Quote Link to comment Share on other sites More sharing options...
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