[Elecraft] Elecraft Digest, Vol 140, Issue 19

[Larry Phipps]

I you always use LP-Bridge and have a spare serial port, you can feed 
the amp directly from one of the LP-Bridge Output ports. The protocol is 
Kenwood, 4800 baud.

Larry



On 12/13/2015 2:35 PM, elecraft-request at mailman.qth.net wrote:
> Date: Sun, 13 Dec 2015 09:52:46 -0600
> From:charles at k5ua.com
> To:elecraft at mailman.qth.net
> Subject: [Elecraft] K3S RS232 "Y" Connector causing port conflict
> Message-ID:<2cd485a3bb5be9207d62cfc6cd7062c4 at k5ua.com>
> Content-Type: text/plain; charset=US-ASCII
>
>   
>
> 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