Jump to content

Vision and Modbus cable pinout

Recommended Posts

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


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.


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...