That’s why our hobby is the best in the world. Millions of thanks to Henry whose kindly sent us a description for a home made programming cable for the Anytone AT5289 II and I’ll add that this and the CRT Concorde I are in the need for some firmware updates.
Thank so much Henry for the sending of the photo, just awesome
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RX and TX should not be directly connected together. A UART can be used in 1-wire mode but that needs a slightly modified circuit to make that happen. The radio probably has that already implemented. No way to tell if the generic CH340 USB interface shown above has that too.
Is the diagram right, with the USB tx and rx wires going to the same pin (i.e. shorted together)?
It was added here as sent. Hopefully the sender can reply