Digirig’s Kenwood cable works fine for audio and PTT with this transceiver so it is possible to enjoy the digital modes in the minimal configuration. Unfortunately TS-570D’s serial COM port doesn’t work with Digirig using the popular digital modes software options.
This gets somewhat technical for those interested. It took a lot of coffee and a logic analyzer to figure it out.
The radio uses DB9 serial port with RS-232 level signals. The baud rate is configured in menu #35 and ranges from 1200 to 57600, most with 8N1 configuration.
For simplicity Digirig only uses two serial port data lines (TxD and RxD) and none of the legacy hardware flow control lines for their intended purpose (CTS, RTS). This works for pretty much every(*) CAT enabled transceiver under the sun because they handle the commands as they come in real time.
The issue:
TS-570D is veeeery slow in handling commands over serial CAT port.
Digirig supports no connections for hardware flow control lines so when transceiver signals that it is busy (Clear To Send is inactive), the traffic doesn’t stop.
If new command comes in while previous command is being processed the transceiver becomes unresponsive and doesn’t recover until rebooted (bad implementation).
There is not enough adjustment range in popular software to space out command to the point that TS-570D can reliably handle them as they come. I tried WSJT-X, Omnirig and Flrig (most flexible timing adjustments and lasts the longest before chocking, but still no Champaign).
See how the transceiver is being bombarded by the commands (yellow) and keeps up for some time with responses (blue) in the beginning, but then stumbles and becomes unresponsive:
@K0TX Thanks so much for this info. Stumbling across this saved me a lot of time doing similar diagnosis. Would it be possible to update the product description for these cables to clarify digirig’s level of compatibility the TS-570D?
I don’t own this rig, but thanks for the great demonstration of troubleshooting. Thanks for going the distance to use a logic analyzer to diagnose this subtle issue.
Is the problem you have uncovered here really a poor implementation of CAT command processing, or that CAT command processing is poorly specified? Is there a reference? A reference implementation? The truSDX seems to take the Kenwood TS480 CAT command set as a sufficient set to emulate.
This troubleshooting comment really shows that I have a lot to learn about CAT control.
The command set is ok. The issue is with the underlying serial communication and radio’s handling of errors.
Radio’s handling of the CAT is way too slow (or receive buffer too short) so that it needs to rely on the hardware flow control to pause sender when it needs more time (busy/full).
Digirig doesn’t offer connections for hardware flow control (CTS/RTS). Those are legacy signals and none of other radios require them.
Radio doesn’t recover gracefully from communication errors and requires reboot after overflow.
K0TX, interesting!
I am trying to use the digirig with my TS-2000. Similar cat set up. I can get the combo to do either rig control OR PTT but not both at the same time. I am using Windows 7 Home Premium. The way I have to use to it is with a separate RS-232 port for rig control and only use the digirig for sound and PTT. Is there any hope for just using the digirig for both?
I saw a schematic for the digirig on the site that seems to show the possibility of using the RTS to trigger the PTT output of the digirig other wise it seems to be triggered my something else.
I have just today got it to work with everything going through the Digirig.
Let me give you a bit of an explanation. I have been running the TS-2000 using various digital modes for 16 years or longer. I first started using a home brew interface and then for most of those years using a SLUSB interface. One thing you learn early on is that you CAN NOT use a PTT going through the RS-232 connector on the back of the rig. To do digital modes with the audio going in the ACC plug (13 pin), the PTT MUST go in on pin 9 of the ACC plug! If you send a PTT command through the serial port it mutes the audio going in the ACC plug.
With that in mind, I tried using the same port for both rig control and PTT without sending a command via the rig control program. It didn’t work. I could get either rig control or PTT but not both at the same time. Finally today, after reading the info on your site and looking at the basic schematic for the umteenth time, it dawned on me that the digirig would not pass the RTS signal to the rig and I could use it for PTT. So when I set the rig control and PTT of the digital mode programs as shown in the attached picture everything worked as it should.
It sure have been nice to have that stated somewhere on the site implicitly rather than having to piece it together from various comments.
I’m currently running a TS-750D on a Digirig mobile v1.9.
CAT-control is not my problem, but I’m not getting the full audio bandwidth delivered through the ACC jack. Menu #32 (Digi filter) is OFF.
Does anyone have any ideas about this - what am I missing?
