ComNav Commander P2 & P2VS Installation & Operation Installation
Document PN 29010074 V4.1 - 79 -
Navigation Data
The Commander P2 has the ability to accept Navigation data & information formatted
according to the NMEA 0183 standard (version 3.00).
Many marine electronics devices (such as digital compasses, GPS receivers, chartplotters,
and electronic charting systems, to name a few) have outputs complying with NMEA 0183.
Two such devices can be connected directly to the Commander P2’s SPU, by wiring them
into the plug mated to the receptacle labelled
J9 – NAV I/O
.
The SPU also has an NMEA output; it transmits the autopilot’s real-time Heading data and
status information, for use by devices such as a radar display, a chart plotter or a navigation
program on a PC.
Refer to
Appendix 2
for more information on the NMEA 0183 sentences accepted and sent
by the system.
The diagram below shows typical wiring for the
J9
connector.
Figure 62 – Typical NMEA 0183 Connections
For proper operation, the connected device(s) must fully comply with NMEA 0183 Standard
(version 3.00):
•
RS-422 electrical levels
•
Baud rate: 4800
•
Serial data format: 8 data bits, no parity, 1 stop bit
•
Correct NMEA sentence structure
•
Checksums are optional, but must be valid if present
If may also be possible to use RS-232 electrical levels, in some cases – such as when using
a PC (see page 181).
The
NAV2
port can optionally be run at 9600 Baud.
•
To do so, you need only set the other device to transmit at that rate. The SPU
automatically sets the rate for this port, by looking for “valid NMEA data” at all
possible Baud rates.
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