The 232 doesn't stand or come from anywhere. It's just a
reference number. RS-232 = Recommended Standard 232
View page
Recommended Standard 232
View page
onion
View page
A good alternative for a RS 232 would be modern USB ports. The
RS 232 is a serial binary single ended data port. This port is
common on computers; however, recently this port has been replaced
by USB ports.