Optoisolation makes sense when it comes to a diagnostic cable
Exactly, there is no point in doing optoisloation and everything is battery powered anyway. For signaling, it is probably best to use a 2-color LED connected to RX TX via a transistor so as not to overload the data line.
I have a CCY BT Basic Qbox and a Stag 4-Qbox Basic - are they compatible? I have a problem with the connection (a message appears about the lack of a driver in the program) - I followed all the steps as in the manufacturer's instructions. If they don't match, can I remake it somehow (a magnet was mentioned in the first post)?
Edit: my mistake, I was using AcGas Synchro, on Ac Stag it works fine.