Do you have the correct cable? you need a null-modem serial cable.. not a strait though.
Also, the default settings are:
19200 bits per second, 8 data bits, No parity bit, 1 stop bit (aka, 19200/8/N/1).
Read the man page to learn how to set these options..
My guess is, on OpenBSD anyway (Connected to COM1):
$ cu -l /dev/cua00 -s 19200
But I could be wrong.
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