Technical FAQs

Ask a Question

How to Connect RS-485 wires that have different port labels

Some RS-485 ports are labelled using the two conventions shown below:

  1. A, B, SH
  2. (-), (+), SH

The two label conventions link to each other as below:
A = -
B = +




Original article#12153
Last Revised: October 24, 2007
Public
All content © 1992-2007 Schneider Electric
Was this helpful?
What can we do to improve the information ?