ComNav Marine 1420 Autopilot System
Appendix E
Connecting the NMEA 0183 Heading Output
Location of terminal strip J5
The 1420 Autopilot has a data bus that sends out NMEA 0183 heading information to other
external devices such as Radars. Heading data is transmitted once per second and
provides two NMEA sentences: HDM (magnetic heading) and HDG (magnetic heading,
deviation & variation). The serial data rate is 4800 Baud. The output signal has enough
drive capability for up to six NMEA 0183 Listeners.
The NMEA 0183 data output format is a two-wire signal. One wire (the ‘A’ signal) connects
to pin 1 of terminal strip J5 and the other wire (the ‘B’ or ‘return’ signal) connects to pin 2 of
terminal strip J5. Terminal strip J5 is located in the lower right side of the Processor circuit
board (see above). The two pin connector required for connecting to the heading output is
included in the Accessory Kit.
Document PN 29010012 V1.3
64
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