MicroPython Forum (Archive)

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In my old days, it always worked to connect RTS,CTS and DTR on each side of the RS232 cable.
You loose the handshake capability, but you can send data over;

Sounds familiar, but there is only RTS and DSR at the device, so it should not matter leaving them open.
When doing stuff like that, people should have at least a Multimeter and a simple logic analyzer. Otherwise you end up lost.

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