Does anyone know of such a beastie. I don't want a TCP Port sniffer, I
need a program that once started, recordds all data passing to and
from the specified local serial port.
I've used this one in the past :-
Serial port monitor software - serial port sniffer & analyzer
but it will not show the raw hex going over the serial port, it insists on translating to Dos or Windows character set equivalents.