hugojose Posted December 20, 2011 Report Share Posted December 20, 2011 Am trying to connect a Vision 120 to a Trihedral VTS Scada usng Modbus RTU serial but am having difficulties with the DB9-RJ11 pin out. I understand it should be RX 2 -> 3 TX TX 3 -> 2 RX DTR 4 -> 6 DSR GND 5 -> 5 GND GND 5 -> 1 shield DSR 6 -> 4 DTR Jumpers PC side: RTS 7 -> 8 CTS PLC side: RTS 7 -> 8 CTS PLC side: cable shield to 1 Shield If this is right, what do I do with 7 and 8 PLC side if the RJ11 only has 6 pins?? Don't suppose Unitronics would have a Modbus DB9-RJ11 cable, would it?? Any help would be greatly appreciated. Hugo Quote Link to comment Share on other sites More sharing options...
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