Table of Contents
Advertisement
■ VTG – Course over ground and ground speed
Version 1.5
$GPVTG, xxx.x,T,,,xxx.x,N,,<CR><LF>
1
Version 2.1
$GPVTG, xxx.x,T,,,xxx.x,N,xxx.x,K*hh<CR><LF>
1
Version 2.3 4.0、IEC61162-1
$GPVTG, xxx.x,T,,,xxx.x,N,xxx.x,K,a*hh<CR><LF>
1
1, 2
3, 4
5, 6
7
8
■ ALR – Set alarm state
$VDALR, hhmmss.ss, xxx, A, A, c--c *hh<CR><LF>
1
1
2
3
4
5
6
■ ALF – Alert sentence
$VDALF,x,x,x,hhmmss.ss,a,a,a,aaa,x.x,x.x,x.x,x,c---c*hh <CR><LF>
1 2 3 4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Chapter 9 Specification
2
3
4
2
3
4 5
6 8
2
3 4 5
6 7 8
: Course over ground, degrees true
: Speed over ground, knots
: Speed over ground, km/h
: Mode Indicator (version 2.3, 4.0, IEC61162-1)
A = Autonomous mode
D = Differential mode
N = Data not valid
S = Simulator mode
P = SBAS mode (IEC61162-1 only)
: Checksum
2 3 4
5 6
: Time of alarm condition change, UTC
: Unique alarm number (identifier) at alarm source
: Alarm condition (A = threshold exceeded, V = not exceeded)
: Alarm's acknowledge state, A = acknowledged, V = unacknowledged
: Alarm's description text
: Checksum
5 6 7 8 9 10 1112 13 14
: Total number of ALF sentences for this message, 1 to 2
: Sentence number, 1 to 2
: Sequential message identifier, 0 to 9
: Time of last change
: Alert category, A, B or C
: Alert priority, E, A, W or C
: Alert state, A, S, N, O, U or V
: Manufacturer mnemonic code
: Alert identifier
: Alert instance, 1 to 999999
: Revision counter, 1 to 99
: Escalation counter, 0 to 9
: Alert text
: Checksum
9-10
Advertisement
Table of Contents
