NMEA0183 is generally supposed to be balanced RS422; but there have been plenty of implementations that were NOT balanced, like the older Garmin four-pin power/data cables.
Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI > On Sep 16, 2016, at 7:03 AM, Gary Russell via CnC-List > <cnc-list@cnc-list.com> wrote: > > Joe is correct. NMEA0183 is not RS232. I think it is RS422, but am not > sure. It might be RS485. At any rate, they often play well together, but > not always. You can purchase RS422 and RS485 converters for USB. > > Gary
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