So are you trying to apply the RJ31X type of thing that we talked about in this earlier tread?

Most of the add-in board manufacturers that are making RS485 ports are using D sub 9 pin connectors as you probably already know.

If so I have not seen a 'standard pinout'. The best I think you could find would be to find a vendor that makes some type of popular RS485 networked sensor instrumentation product line and use their pinout.

For example check out this rs485.com WEB site.

There are links to some interesting stuff such as:
http://www.rs485.com/pfaq.html
http://www.rs485.com/rs485spec.html
http://www.rs485.com/downloadfiles/hubcat.pdf
http://www.rs485.com/downloadfiles/ssac24t.pdf
http://www.rs485.com/downloadfiles/ssac24r.pdf
http://www.rs485.com/downloadfiles/db9cat.pdf
http://www.rs485.com/downloadfiles/irsfc24xt.pdf

Michael Karas