Garmin Apollo GX60 Comm Installation Manual - page 80
Serial Interface Specifications
72
Apollo GX50/60/65 Installation Manual
GPSS
S
ERIAL
O
UTPUT
The GPSS output message provides information to the appropriate autopilot for roll steering.
Baud Rate: .........................................9600
Data Bit:.............................................8 BITS
Stop Bit: .............................................1 BIT
Parity:.................................................None
Output Rate:.......................................Approx. 1-sec ±0.5 sec
Buffer length Normal:........................Approx. 32 bytes to ??? bytes
The Apollo GX Series will output serial data in the following format:
where.
is the ASCII start of character (1 byte )
is the item designator (1 byte i.e. “B” )
is the item data (see item format in following pages)
is the item terminator (1 byte Cr )
is the ASCII end of character (1 byte )
Table 14 - Ascii Autopilot data
Id Item
Format
Len Item
Description
C ddd
3
Track:
(magnetic); ddd=degrees
D ddd
3
ground speed:
ddd=knots
E ddddd
5
distance to active waypoint:
ddddd=nm * 10
L dddd
4
bearing to active waypoint:
(magnetic); dddd = degrees * 10
h sddd
4
Horizontal Command Signal:
s=sign: L = bank left. R = bank right. X = invalid data.
ddd = degrees * 10