ThomasI populated and tested the first USB-RS232 board - it works! To be honest, I still can't believe that I hand-soldered the CH340E in MSOP10 without completely messing it up!
The switch on the backside is for activating a "local echo". I'd like to have that feature for operation with e4thcom (just as any other terminal program it expects an echo!). Standard RS485 behaviour doesn't read the bus while sending. I guess that this is for compatibility of RS482 with RS422. It would have been better to read the bus while sending since this would enable collision or error detection.
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