[aprssig] RS232,TTL and RS422 interfacing

[Robert Bruninga]

Here is a nice document that shows all the ways to do simple connections
between all the serial standards, TTL, 232, 422, etc.

I just put it in my “how-to” folder:

http://www.ti.com/lit/an/snla041a/snla041a.pdf



Bob, WB4APR
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