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Sat Sep 12 17:12:03 CEST 2015

RS485 polarity numbering

This is very confusing.

What works for me, using A/B naming convention from chip
manufacturers:

- A=D+ non-inverting / B=T- inverting
- uC UART IDLE is logic HIGH, A > B.  T+ > T-

The RS485 names A/B opposite[1].  Thanks!


[1] http://www.bb-elec.com/Learning-Center/All-White-Papers/Serial/%95-Polarities-for-Differential-Pair-Signals-%28RS-422.aspx?utm_source=redirect&utm_medium=SiteTransition&utm_content=bbeurope



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