KVH Industries TracVision G4 Technical Manual page 137

TracVision G4 Technical Manual
Port 3 is not used if GyroTrac is
connected to the TracVision
antenna.
NMEA1 Magnetic
Heading Output
146
G.2 Serial Port Outputs
Serial ports #1 and #2 may be individually programmed
to output any of the message formats described on the following
pages. Up to four NMEA 0183 listening devices can be connected
to each of the serial ports. Serial Port #1 also has a pass-through
duplicate port.
NMEA
The NMEA message format conforms to the
NMEA 0183 version 2.20 standard for message
structure.
KVH RS-422
The KVH message format is an RS-422 message
format giving stabilized pitch, roll, and yaw data.
Data output from Port 1 will be at 4800 baud while
data from Ports 2 and 3 will be at 9600 baud; this
message may be used in any device capable of
receiving this data rate.
Cetrek Proprietary
The Cetrek proprietary message format is a
stabilized heading output for use with Cetrek
autopilots.
Each serial port can be independently programmed to output data
at a rate of 1 Hz to 20 Hz, selectable in 1 Hz increments. The default
data rate is 10 Hz.
Table G-1
NMEA1 Magnetic Heading (HDM)
Communication:
Update rate:
Sentence type:
Sentence breakdown:
4800 baud, 1 start bit, 8 data bits, 1 stop bit,
no parity
Selectable at 1 to 20 Hz (10 Hz default)
$HCHDM,XXX.X,M,* hh <cr> <lf>
HCHDM NMEA talker and sentence ID
XXX.X Stabilized magnetic heading in
degrees and tenths
M Magnetic heading, ASCII hex
0x4D
* ASCII hex 0x2A
hh Checksum
cr Carriage return, ASCII hex 0x0D
lf Line feed, ASCII hex 0x0A
54-0147