In article , Dave Plowman (News)
writes

The device I need to connect to says 115200 baud.

No - TX and RX and obviously ground. Those are the only connections on the
device DB9.

High baud rate and no hardware handshaking, though 4m is not long for
RS232. I'd suggest a good quality screened cable. The mic cable
suggested by another poster should do the trick. Connect the screen to
the plug body at the PC end.

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