[TRLog] RS 232 voltages +0.08 or -11.2

[Guy Olinger, K2AV]

New motherboard and extra serial card. Both are showing +0.08 or -11.2 volts
reference chassis ground as their state voltages. The CAT port on the MP talks
to this fine, but the cord I made up with the transistor, resistor and diode
circuit I built into the db9 plug from the TR manual just barfs.

Do these need pull-ups from +12 (not on the DB9 socket anywhere) or is this a
new interface level from Y2K and beyond and need a different circuit. Com 1  &
Com 2 are on the motherboard.

Anybody run into this and solve it?

- - . . .   . . . - -     .   . . .     - - .   . - . .

73, Guy
k2av@contesting.com
Apex, NC, USA



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