Query Location Command - Globalstar ST100 User Manual

8545-0194-01 v1.0
4.2.2.24. "Query Location" command
This command returns the GPS coordinates and timestamp of the most recent fix obtained by the device (which might be as
"old" as the track interval time). It returns zeros if no fix has been obtained since reset, or the last fix attempt failed. See section
on 24-bit location format for a description of the latitude and longitude encoding.
BYTE BITS
0 0 - 7
1 0 - 7
2 0 - 7
3-4 0 - 15
This response is sent to response to a "Query Location" command.
The timestamp fields represent the exact second the fix being reported was obtained.
BYTE BITS
0 0 - 7
1 0 - 7
2 0 - 7
3
4
5
6
7
8
9-11 0 - 23
12-14 0 - 23
15-16 0 - 15
Command: AA 05 25 76 B2
Response: AA 0C 25 2B 48 5B BF F0 2B 00 2E A1
Latitude = 0x2B485B (30.4331), Longitude = 0xBFF02B (-90.0870)
ST100 User Manual v1

QUERY LOCATION COMMAND

PARAMETER
Leader
Length
Command Code
CRC
QUERY LOCATION RESPONSE
PARAMETER
Leader
Length
Command Code
Month
Day
Year
Hour
Minute
Second
24-Bit Signed Integer encoded Latitude. 180 degrees of latitude coded in signed binary. Byte 3
Latitude
24-Bit Signed Integer encoded Longitude. 360 degrees of longitude in signed binary. Byte 6 is
Longitude
CRC
Confidential & Proprietary Information
DESCRIPTION
Always a value of 0xAA
0x05
0x25 = Query Location command
DESCRIPTION
Always a value of 0xAA
0x11
0x25 = Query Location command
Value of 1 - 12
Value of 1 – 31
Year minus 2000. Example, 2020 is reported as 20.
0 – 23 GMT
0 - 59
0 - 59
is MSB. Positive Latitude corresponds to North Latitudes.
MSB. Positive longitude corresponds to East longitudes.
Will contain the response CRC
47