On Sat,8/22/2015 10:21 PM, Richard W. Solomon wrote:
Not to flog this horse any further, but I direct you to page 85 of the K2
Manual where the DB-9 connector is labeled ..."RS-232 and AUX I/O"... .
Is it RS-232 or not ??? Is it mis-labeled ????
The fact that it says RS-232 AND AUX I/O should be a clue -- a full
RS-232 interface requires the use of all 9 pins, leaving nothing for AUX
I/O. All of the ham gear I've ever interfaced to uses only two circuits
and three pins -- 2 (RXD),3 (TXD), and 5 (Sig Gnd) for control, leaving
the other pins and lines for other uses. Pins 4 (DTR) and 7 (RTS) are
used by many logging programs to send CW and PTT. There's a piece in QST
from 10-15 years ago showing how to build an ICOM interface getting
power from either DTR or RTS (I don't recall which).
73, Jim K9YC
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