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[aprssig] Kantronics KPC3+ Issue

Dave Baxter dave at emv.co.uk
Wed Dec 7 16:21:23 UTC 2005

Anything to do with the serial link between the PC and TNC, at a guess.
Is the TNC setup for Hardware Handshake, while AGWPE is expecting to use
XON/XOF perhaps?  Is the PC serial port coming up OK each time...

Can you communicate with the TNC ok with another program?  (NOT while
AGWPE is running!)  Try using a terminal program for example.  If when
you connect to the port that the TNC is hanging off, and you sudenly get
a screenfull of stuff from the TNC, then that is the problem,
handshaking and all that.

If not, try sending a ^Q (Put "Cap's Lock" on, hold down the "Ctrl" key,
and hit "Q")  If it's waiting for an XON, that should wake it up, try a
couple just in case it's realy in sulk mode...

However, even if after that, you cant communicate with it, but cycling
the TNC's power brings it back to life (while connected to the PC
running the Terminal program) then it's something that the TNC was told,
that it doesn't understand, probably from the PC.

I do not know the KPC3 or AGWPE, so I'll leave it to others to advise on
the correct settings.

If you get the TNC in a mode where it's monitoring the channel, and
spewing data out to the PC, sending a Ctrl+S (XOFF) should stop it.
Sending a Ctrl+Q (XON) should let it continue again.  That will confirm
it's using that method of handshake, or "Flow Control" to use the
correct term.

Have Fun!..

Dave G0WBX.

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of Amateur 
> Radio WB8NUT
> Sent: Wednesday, December 07, 2005 3:24 PM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] Kantronics KPC3+ Issue
> AGWPE is connected to TNC and then the applications are go to 
> the TNC via AGWPE.  Allows multiple applications to access 
> the TNC at the same time.  So, I am a bit ignorant that what 
> I have possibly misconfigured.  
> What should I look for and where?
> Thanks,
> Duffy
> Robbie, wa9inf wrote:
> > Duffy,
> >
> > If I am not mistaken, it would indicate the pc, or software is not 
> > allowing communications from the tnc and the buffer of the tnc is 
> > full.. You may have the port misconfigured??
> >
> > Robbie
> >
> > Amateur Radio WB8NUT wrote:
> >
> >> Lately, no matter which APRS application I use with the KPC3+, the 
> >> Connect (Con) LED will come on and stay on sometimes once a day, 
> >> sometimes it happens every hour or so. Of course when this 
> happens, 
> >> the TNC will not transmit the beacon packets although the 
> application 
> >> does send that command to the TNC.  Just while the Con LED 
> is on, the 
> >> TNC will not send the beacon.  The only way to reset it is to turn 
> >> off the TNC and turn it back on.  Any ideas as to what is causing 
> >> this and how I might be able to prevent this condition 
> from happening 
> >> in the future?  Another ham said to use XKISS with the 
> AGWPE, which I 
> >> tried but that did not solve the problem.
> >>
> >> Thanks,
> >>
> >> Duffy
> >> www.wb8nut.com

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