[Elecraft] K3S RS232 "Y" Connector causing port conflict

[charles at k5ua.com]

I have an OM2500A amp that works perfectly with my K3S when it is the
only thing connected to the RS232 of my K3S.

I am using LP-Bridge and Na3P to create a panadapter and this works
perfectly when the computer is the only thing connected to the RS232 of
my K3S.

The manual shows how to use a RS232 "Y" splitter so that two devices can
share the RS232 port of the K3S, but when I use the "Y" splitter (one
side to the OM2500A amp and one side to the computer) the following
malfunctions occur:

1. The OM2500A display rapidly changes from the correct VFO frequency to
an out-of-band frequency over 2 Mhz away.
2. The pandapter frequency readout ceases to function.

I assume there is a port conflict, and I wonder if anyone knows the
correct pin-out of the RS232 line to the OM amp so that it will be a
passive listener on the DB9 cable?

Thanks,

Charles K5UA