approved by the Electronic Industries Alliance (EIA)
for connecting serial devices
. The RS-422 and RS-423 standards are designed to replace the older RS-232
standard because they support
higher data rates
and greater immunity to electrical interference. All Apple Macintosh computers
contain an RS-422 port
that can also be used for RS-232C communication.
RS-422 supports multipoint connections whereas RS-423 supports only point-to-point connections.