th_in_gs,

I suspect your serial converter is expecting a ‘real’ RS232 signal, with its old-school now-weird voltage levels.

Your USB serial adapter is probably using 5V or 3V so-called ‘TTL’ signaling (which in the real world is mostly cross-compatible between 5V and 3V)

Good explanation here: https://www.sparkfun.com/tutorials/215

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