[Elecraft] K2 interface with steppIR and computer

[Don Wilhelm]

John,

You said you were "building a Y cable".  I do not know the configuration 
of your cable, but it sounds like you may have the transmit data 
connected from both the SteppIR Controller and from the computer - the 
transmit data from the two sources will "fight" and communications will 
cease.

The SteppIR Y cable does not connect transmit data from the SteppIR 
Controller - it depends on the logging application to poll for the 
transmit frequency, and the SteppIR Controller just listens in on that 
information transfer.

So, if you have connected both TXD and RXD on both sides of the Y cable, 
that is your problem - RS-232 cannot have multiple drivers on any 
connection, although multiple receivers will work.

73,
Don W3FPR

On 1/7/2012 10:08 AM, ke4d at att.net wrote:
> I built my serial cable for the K2 to talk to my SteppIR controller from the Elecraft manual. Works just fine. It also talks to my computer for HRD, N1MM etc. So I decided to work on having the two interfaces work together like they did with my IC 746 Pro.  However, building a Y cable doesn't seem to be working out the way I want!  Each device works fine when I have it plugged into the Y cable by itself but when I plug in both at the same time, One or the other will freeze up.  I am simply using pins 2, 3 and 5 from the K2 serial port wired straight through to the female DB 9s at the device end and have 7 and 8 jumpered at the external device end.  What am I doing wrong?
>
> My KPA500 arrives on Monday so I'd like to get this resolved before my next project!
>
> John KE4D
> K2 #7231
>
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