Dear Keith, I have a Kenwood TS2000 and currently working on using its internal TNC for digital AX.25 packet communication. I didn't had any success yet in digital communication. I use Kenwood ARCP 2000 to configure and send commands for internal TNC. It is very similar to using Hyper terminal, it gives the terminal window as soon as you turn on Packet Operation of TS2000.

I have also done uplink and downlink of APRS packet using ISS digipeater. For this I set the internal TNC to KISS mode and used AGWPE along with UISS software.

Regards, Rupesh