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1.8.3 Northstar Navigation Devices Protocol
Grounding pin 9 of the DA-15S serial data receptacle results in a protocol compatible with
some navigation devices manufactured by Northstar and Garmin. The Digitizer will send a
10-byte message. The message begins with ALT followed by a space and five altitude
bytes; concluding with a carriage return. (2400bps, 8 data bits, 1 stop bit, no parity.) The
following are examples of serial messages for these devices:
Message
ALT 02500
ALT -2500
1.8.4 Magellan Navigation Devices Protocol
Grounding both pins 9 and 10 of the DA-15S serial data receptacle results in a protocol
compatible with some navigation devices manufactured by Magellan. The Digitizer sends a
seventeen-byte message beginning with $MGL, followed by a +/- sign and five altitude
digits, then T+25, a checksum and concludes with a carriage return. (1200bps, 7 data bits,
1 stop bit, even parity.) The following is an example of a serial message for Magellan
devices:
Message
$MGL+02500T+25D6
1.8.5 ARNAV Systems Protocol
Leaving pins 9 and 10 of the DA-15S serial data receptacle open, the ARNAV Systems
protocol MUST be software selected see §4.6 for protocol selection details. Once selected,
the Digitizer will send a 24-byte message. Beginning with a $PASHS followed by a comma
and ALT, then a +/- sign followed by five altitude digits (in meters,) then an asterisk and a
checksum followed by a carriage return and a line feed. (9600bps, 8 data bits, 1 stop bit,
no parity.) The following is an example of an ARNAV serial altitude message:
STX$PASHS,ALT,+00033*1B
1.8.6 UPS AT 618 Loran Devices Protocol (IIMorrow)
Leaving pins 9 and 10 of the DA-15S serial data receptacle open, the UPS AT 618 Loran
devices protocol MUST be software selected see §4.6 for protocol selection details. Once
selected, the Digitizer will send a seventeen byte message beginning with # AL, then a
space followed by five altitude bytes; the letter "T" and the number "25"; two checksum
bytes and a carriage return. (1200bps, 7 data bits, 1 stop bit, odd parity). The following is
an example of an UPS AT 618 Loran serial altitude message:
#AL +00800T+25D8
Definition
C
Pressure Altitude 2500 feet.
R
C
Digitizer disabled.
R
C
Pressure Altitude 2500 feet.
R
Message
C
L
ETX
R
F
Message
C
R
Page 9 of 57
Definition
Definition
Pressure Altitude 33 meters.
Definition
Pressure Altitude 800 feet
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