Comm Data Output; Figure 13 Moving Map Data Output - II Morrow Inc. Apollo SL50 GPS Installation Manual

Serial Interface Specifications
Example Moving Map Data Output
AN 34 1570
BW 118 4390
C306
D210
E02682
GR0006
I3059
KSFO
L3058
QE140
T---------
<binary data>

Figure 13 Moving Map Data Output

C D O
OMM ATA UTPUT
The format of the comm data output is as follows. This data output is compatible with the
SL40 for sending frequency data to the comm.
Baud rate: ..........................................9600
Data bits: ...........................................8
Stop bits: ...........................................1
Parity: ................................................none
Output rate: .......................................approx 2 seconds
Message length: ................................variable, approx 83 to 484 characters
The comm data is output using the following format.
$PMRRC<msg_id><msg_data><chksum><cr>
The checksum is computed by an 8 bit addition of the msg_id and msg_data characters,
ignoring carry if any. The resulting 8 bit checksum is converted to two ascii characters by
taking the upper and lower nibbles, adding 30h to each, and placing the most significant
character first in the data message.
Airport Ident Output
This message is used to output the selected airport ident.
Message Format
$PMRRC04tiiii<chksum><cr>
04 .......message id
t ..........list type, outputs a 1
iiii.......ident, four character ascii
Example Message
$PMRRC041SLE<space>99<cr>
Output ident of "SLE" for the following frequency information.
50
34°15.70' latitude
118°43.90' longitude
306° track angle
210 knots
268.2nm to waypoint
0.6nm right of course
305.9° desired track
SFO waypoint ident
305.8° bearing to waypoint
14.0° east magnetic variation
No alarms, data not flagged
From Table 7
Apollo SL50 / SL60 Installation Manual