"Serial IO board K1 is controlled by "SBYB" which traces to signal "BYPRLY".
The names suggest "bypass relay" but under what circumstances is this signal
set/cleared? In other words, when does K1 open the data out line?"
Well I found the answer thanks to another KPA500 owner running a similar
I started down this path because I'm trying to help a Scottish op who seems to
have a failed KPA500 XCVR port. (Scope shows no indication of polling when Ser
Poll is on.)
KPA500 has an IO board with two serial interfaces. One is for connection to a
PC and the other for connection to a transce
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