Not sure what I’m doing wrong here. I have a Digirig RS232 and the Yaesu DIN cables that work with the Kenwood TM-D710… When I connect the COM cable to either the Audio or Serial output on the Digirig and connect to the device using a serial program, I get no response. I’m connecting to the back of the head unit COM port where the TNC is active and I’ve verified the COM speeds across everything. In fact I just default set them to 9600. I see no TNC responses. When I use a standard cable (RT programming cable) I’m able to connect to the TNC without issue. I’m also unable to use the cable for other data connected to the body of the radio for CHIRP access…
There may be some confusion with the terminology. Digirig is not a TNC and the serial port is used for the transceiver control (CAT) and not for the data payload.
Before we go into the CAT configuration, please connect the audio cable (MiniDin6) to the audio socket on Digirig and to your transceiver. With that you should be able to configure the software TNC such as VaraFM or SoundModem inside the shell software such as Winlink. Use PTT by RTS over Digirig’s COM port while configuring the software. Once that is all working we can turn our attention to the serial port and CAT control where available.
Thanks for getting back to me. I’m able to use the TM-D710 to send via RTS it PTTs just fine with software like Winlink. What I’d hoped to do was either use the serial connection from the digirig to CAT control the radio OR use the serial connection to connect to the radio’s TNC and run commands to connect to packet nodes. The basic connection using the “audio” side of digirig works as expected. So I’m wondering about the “serial” side.
Looks like TM-D710 is using different MiniDin8 pinout for serial port from that in Yaesu:
Here’s Yaesu FT-8xx:
Here’s Kenwood TM-D710:
Note TXD and RXD swapped around and also CTS and RTS now available. I’m going to prototype a cable. I have mailed you a prototype cable with the updated pinout. Please let me know if that addresses the issue.
Hi Denis, I got the new cables today (FAST!) and was able to use the Kenwood cable to successfully connect to the COM port on the back of the TM-D710 head and interact with the TNC. Note, even though the COM port goes up to 57600, I was not able to get a working connection until I backed down to 9600. Not really an issue, just something I noticed. Thanks again!