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 Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted December 22, 2011 MVP 2023 Report Share Posted December 22, 2011 I'm assuming that the scada is running on a PC with a real serial port. The PLC doesn't use the handshake lines. Have you tried using your programming cable as the interface cable? It should work fine. Joe T. Link to comment Share on other sites More sharing options...
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