RS232 is single-ended (two-wire), and RS422 is differentially-balanced (three-wire). NMEA0183 was never originally a three-wire system, so couldn't be RS422. But you can wire RS422 to accept single-ended signals.
Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On Oct 5, 2012, at 4:02 PM, Della Barba, Joe wrote: > NMEA can *usually* work well enough with RS-232, but it is really closer to > RS-422. The reason we seem to get away with this mix-n-match is we only use > ONE talker. See below from > http://www.cruisersforum.com/forums/f13/nmea-0183-and-rs-422-vs-rs-232-a-12967.html
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