Disappearing Key Assignments

[Sylvain Cote]

(01-02-2020 05:58 PM)cdmackay Wrote:  So neither lights means 0V, i.e. not connected/not in use?

Not connected or not driven.

RS-232C signal levels are:

Code:

Logical 1 = −15V to  −3V
Invalid   =  −3V to  +3V
Logical 0 =  +3V to +15V

(01-02-2020 05:58 PM)cdmackay Wrote:  My other confusion was whether the left bank of 8 lights was 4 pairs of [0,1] for signals 1–4, or the 0 indicators for all 8 signals. Sounds like it's the former.

Yep! that's it!