Greetings.?

From your description, it sounds like you used Putty to put your TNC into KISS mode, then told YAAC you had a KISS-only TNC, so it wouldn't take the TNC out of KISS mode when you opened the Test Port window or shut down YAAC.

I would recommend instead leaving your TNC in command mode before starting YAAC, and changing your Serial_TNC port configuration to specify the KISS command for TNC2-compatibles (which your TNC220 appears to be).

Then, when you start YAAC, you should see at that time the light-blinking pattern of your TNC switching to KISS mode. When you open the Test Port window, the TNC will be switched back to command mode (so you can do something with it in the window), and returned to KISS mode when you close the Test Port window.

Also, I would recommend changing the serial port baud rate up to 9600, so there is less latency about forwarding received packets from the TNC to YAAC (and vice versa). The radio side would stay at 1200 baud.

Hope this helps.

Andrew, KA2DDO

author of YAAC

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I am trying to get an old Paccom TNC 220 which I built from kit in the 1980's working as a KISS TNC.

I am running YAAC under Ubuntu 24.04 on a dedicated PC with on "old type" RS 232 port which appears as /dev/ttyS5

The TNC 220 is working fine as a Command mode TNC using PUTTY to enter commands all seems normal working as it did in the 1980's.

It has a KISS mode which I never previously needed so I am unsure how well it is implemented.

I want to use it as a KISS TNC with YAAC.

I set the radio ?and terminal BAUD both to 1200
Word Length to 8
KISS ON
Restart

TNC 220 lights flash in correct sequence to indicate it has entered KISS mode.

I use the the configuration wizard to configure YAAC - so far so good.

I add a Serial KISS TNC and configure it. /dev/ttyS5 what I was using with Putty when I use it as a command type TNC.

When I press the TEST Port button a blank command window opens.

If I deliberately enter an invalid/non-existant port e.g. /dev/ttyS6 (when it should be /dev/ttyS5) then I get the error "Unable to bring up Test-Port for Serial_TNC" but when I enter a correct port I get the blank command window .

From this I assume indicates YAAC has detected a KISS TNC?

The on-line help states the ... "Test Port" button provides a means of verifying that you have connected to the correct place; it opens a terminal window connected to the configured serial port so that you can manually test the TNC for the desired operation. To complete testing, close the terminal window."

My question is "What do I enter in this window to "Manually test the TNC?"

What should I see/do in this window to test that the TNC is operating correctly?

There is no packet traffic in my area for it to decode.

What commands should I enter in this command window to test the TNC?