[aprssig] How to send packet through a KISS modem

[Dave Haynes]

Are you sending the type indicator byte before your packet? After your 
opening $C0, the first byte indicates the content of the message to the 
TNC. For a data packet, the indicator byte will usually be $00.

All detailed in "The KISS TNC: A simple Host-to-TNC communications 
protocol" by Mike Chepponis K3MC and Phil Karn, KA9Q

Dave
G1TVL

rfinesmith at aol.com wrote:
> Does anyone in the group have experience programming to a KISS modem to 
> transmit?  I have no problem receiving and decoding APRS packets from a 
> TNC in KISS mode (using a my Kantronics KPC3+), but I can't figure out 
> how to get the TNC to send packets while in KISS mode.  I am wrapping my 
> raw AX25 packets in \xC0 prior to writing to the modem, but that doesn't 
> work.  Also, I have tried to manually send text while in kiss mode, 
> using HyperTerminal, also wrapping the text in \xC0 (i.e., <ALT>-0192).  
> No luck.
> 
> Thanks,
> Robin, AA3NJ


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