But there should have been another connection on the Argent board for the DB9 to connect to. The no-installed-daughter-board use of the internal cable is to bring the audio and PTT connections to the DB9 for connection to an external TNC. To quote the directions from the Argent manual:

To install the board, disconnect power to the radio and remove the four screws
holding on the bottom cover plate. A multi-colored cable connects the rear
connector to the radio’s main board. Remove the cable from the radio board,
plug it in to the receptacle on the T3-135 board, and plug the T3-135 board’s cable
into the radio board. The supplied hook and loop fastener can be used to secure
the T3-135 board to the VCO case.

Hope that helps.

Andrew, KA2DDO

________________________________________
From: [email protected] <[email protected]> on behalf of DavidC KD4E <qrv@...>
Sent: Thursday, April 18, 2024 8:04 PM
To: [email protected]
Subject: Re: [yaac-users] YAAC - Installed on inovato Quadra but no USB to TNC option

The DB9 connector isn't ... connected ... to anything.

The internal connection it uses is being used by the Argent Data board.


On 4/18/24 19:57, Andrew P. wrote:

Well, another alternative is to ignore the USB pigtail coming out of the radio and use the DB9 connector with a USB-to-RS232 adapter instead. If you have the relevant hardware, try that and see if it works.

Andrew, KA2DDO

________________________________________
From: [email protected] <[email protected]> on behalf of DavidC KD4E <qrv@...>
Sent: Thursday, April 18, 2024 7:36 PM
To: [email protected]
Subject: Re: [yaac-users] YAAC - Installed on inovato Quadra but no USB to TNC option

It's in digital mode.

The radio has the square wave symbol.

Also, it doesn't play the audio in digital mode, you just hear clicks on the speaker.