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[linux] Linux/Packet Programming Question

Bob Nielsen nielsen at oz.net
Mon Aug 23 23:20:32 UTC 2004

On Mon, Aug 23, 2004 at 03:08:41PM -0500, J. Lance Cotton wrote:
> Bob Nielsen wrote:
> >On Mon, Aug 23, 2004 at 10:07:45AM -0700, Brett Collingwood wrote:
> >>
> >>The problem I have is that when I enter KISS mode, the TNC hangs.  I
> >>no longer can control the TNC, break out of the connection, etc.  The
> >>only way I've discovered to break out of KISS mode is to do a hard
> >>reset of the TNC, which isn't acceptable for this application.
> >
> >I am not familiar with Kantronics implementation of KISS, but with the 
> >TAPR firmware, sending a "255" will return the TNC to normal operation.
> And if that doesn't work, the Kantronics way is to send the three values:
> 0xC0 0xFF 0xC0
> (that's decimal 240 255 240) to the serial port. The 0xFF value is the 
> "exit KISS" and the 0xC0's are the "frame end" commands. The first one is 
> to clear the command buffer and the second is to end the 0xFF command frame.
> Perl ought to have no problems echoing 3 bytes to a serial port.

Yeah, I had forgotten about the 0xC0, which should work when a simple 
0XFF may not (I have only used dedicated KISS eproms for the past 10 
years or so).

Bob N7XY

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