I'm not making this up.
http://www.nmea.org/content/nmea_standards/nmea_083_v_400.asp
" NMEA 2.00 Published January 1992 (NMEA 0183 migrated from RS 232 to RS422)"

Now if it was published in 1992 why is the industry not complying to this? Except for the Leica MX420-8 and matching DGPS antenna I have which is all twisted pairs as per RS-422 my brand new Standard Horizon CP300's power/data cable has single ended com ports.