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[aprssig] Help with Interfacing a GPS to Kantronics KPC-3

EXT-Maetta, John john.maetta at boeing.com
Thu Jan 4 15:14:26 UTC 2007

'morning Earl,

I will look into that, but I have tried swapping data pins from the GPS
to the TNC with out any luck.  But I will try your suggestion again.
You said it right enough for me to get your meaning. DTE vs DCE, still
confuses me to this day : )


-----Original Message-----
From: Earl Needham [mailto:needhame1 at plateautel.net] 
Sent: Wednesday, January 03, 2007 2:48 PM
To: TAPR APRS Mailing List
Subject: RE: [aprssig] Help with Interfacing a GPS to Kantronics KPC-3

At 03:41 PM 1/3/2007, EXT-Maetta, John wrote:
>I use my laptop's serial port with Hyperterminal and cable to 'simulate

>the GPS' by sending the captured GPS $GPxxx strings to the KPC.
>This is the same cable, laptop and terminal program I use to set the 
>KPC up.

         But what I'm trying to say, and it may be more basic than what
is needed here, is that the TNC is configured the same as a modem --
what do they call that???  DCE or something?  And it appears your GPS is
configured the same way, because you can see the data from the TNC (the
"sign on message") and you can also see the strings from the GPS.  This
means that data FROM each is on the same pin, when it should, in fact,
be on different pins.  The GPS should emulate your computer, not the

         Somebody jump in here, I know what I'm trying to say, but I
don't have the right words to say it!

         7 3

Clovis, New Mexico DM84jk
"Just say NO to DHL" 

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