Garmin Apollo CNX80, Installation Manual

Page: 124 / 168

Appendix B - Serial Interface Specifications
B-8 560-0982-00 Rev D Apollo CNX80 Installation Manual
Table B- 6 - Moving Map ASCII Navigation Data
ID Data Format Length Description
p sdddd 7 s = ± dddd = {0000 - 5999}
Pressure Altitude (-1500 to +5999 tens of feet +/- sea level).
Field is dashed when invalid “-----”.
v vDddd 7
VDI:
v =
VDI Flag
{ ‘-‘ Flagged || ‘v’ Valid }
D = Needle { ‘C‘ Center || ‘U’ Up || ‘D’ Down }
ddd =
Deflection Value
ASCII (000 – 120)
h sddd 4
Horizontal Command Signal:
s=sign: L = bank left. R = bank right. X = invalid data.
ddd = degrees * 10
Table B- 7 - Moving Map Binary Route Data
Byte Data Format Description
1 w Item designator
2-3 dd Current waypoint number in ASCII (01h to 20h)
4 xiannnnn Sequence number
x = undefined
i = 1 if last waypoint
a = 1 if active waypoint
nnnnn = unsigned binary waypoint number
5-9 ddddd ASCII waypoint identifier
10
11
12 sddddddd
xxmmmmmm
xhhhhhhh Waypoint latitude - packed, unsigned binary
s = sign: 0 for north, 1 for south
ddddddd = degrees
mmmmmm = minutes
hhhhhhh = hundredths of minutes
x = undefined
13
14
15
16 sxxxxxxx
dddddddd
xxmmmmmm
xhhhhhhh Waypoint longitude
s = sign: 0 for east, 1 for west
dddddddd = degrees
mmmmmm = minutes
hhhhhhh = hundredths of minutes
x = undefined
17
18
nnnnnnnn
nnnnnnnn Magnetic variation at waypoint
LS byte (msbit...lsbit)
MS byte (msbit...lsbit)
Two’s complement binary in sixteenths of degrees, easterly
variation is positive.
19 <CR> ASCII carriage return (0Dh)