Ok I have eliminated the Signal Link and connected the radio directly to a usb slot. dmesg sees the new cable and
dmesg | grep tty shows
145.188075] usb 1-1: pl2303 converter now attached to ttyUSB0
[ 877.476236] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0
[ 1210.265328] usb 1-1: pl2303 converter now attached to ttyUSB0
Now I have a new error.
Failed to communicate with radio: can only concatenate str (not “bytes”) to str
Any thoughts?
Now you have your serial port!
This seems to a software error, from looking at a quick internet search.
Chirps is giving the first part, saying it failed to communicate. It is then relaying the second part which seems to come from Python. A scan of the search results suggests it is due to running Python2 code on a Python3 interpreter.
Are you using the latest version, as indicated on the Chirps website?
You may now have more success on a radio support forum. Let us know if you have success.