2020-05-06, 09:15 PM
(2020-05-06, 11:20 AM)glowntiger Wrote: what kind of autopilot? NMEA0183 V1 or older ( Means RS422 or toggling 12V??
I try to interface a Raytheon Autohelm 300, it uses Seatalk1 for all sensors but also features an NMEA0183 interface in/out for most of the data I want to send and receive.
(Attached manual pdf at page 70)
It specifies in the Service manual that I've gotten hold of that NMEA in and out is a "Irregular train of 12V pulses" at + and 0V at -.
That sounds distrubing... probably v1 then?
However the input is described as NMEA Out + and -, which for me would point to it being differential, but service manual says otherwise...
It has to be possible to convert this 12/0 into 5+/5- with some basic electronics, right? Perhaps even on the MCS board for me to do?
Jeanneau Sun Odyssey 42.2 - All Openplottered and hooked up on online.