Special Consideration For "Byte 7" In The Next Several Commands; Proprietary Track" Command - Globalstar ST100 User Manual

8545-0194-01 v1.0

4.2.2.12. Special consideration for "Byte 7" in the next several commands.

The following commands cause the ST100 to transmit either a single burst message, or to enter track mode or to modify a track
mode, wherein bytes 1,2,3,4,5 and 6 of the over the air message contain the latitude and longitude location data. The user may
set bytes 0, 7, and 8 (and subsequent packets in the case of the "Send Redundant Burst with GPS" (0x33) command) to any
value of his choosing with a special exception for "byte 7". The commands for which this rule applies are:
0x30 - Proprietary Track
0x33 - Send Redundant Burst with GPS
0x34 - Proprietary Motion Activated Track
In any of the above modes, if the user specifies a value for "Byte 7" with the most significant 4 bits all ones ((<byte 7> & 0xF0)
= 0xF0) the following special behavior is activated:
The 4 most significant bits of byte 7 become status flags with the meanings as follows:
0x10 = RESERVED
0x20 = Low Battery (Tracking rate reduced to low battery rate)
0x40 = GPS location invalid
0x80 = GPS location of low confidence

4.2.2.13. "Proprietary Track" command

This command allows the initiation of a periodic track message with user defined data prepended and appended to the latitude
and longitude fields. A periodic 9-byte custom track message, transmitted nominally at the interval specified, will result.
The behavior of this mode differs somewhat from the same mode's behavior in the STINGR product. In the ST100 board
implementation, if the interval is set to 30 minutes or greater, a redundant burst transmission will be initiated at each interval,
with the number of attempts and the timing between the attempts as specified in the "setup" command. If the interval is less
than 30 minutes, a single transmission will be sent per interval.
If the interval is 40 minutes or greater, the ST100 board will randomize the start of each burst by +- 10 minutes around the
nominal. For example, if a track mode with an interval of 1 hour is started at 12:00, the next burst position report will begin
randomly between 12:50 and 1:10, the one after that will begin between 1:50 and 2:10, etc.
While in Proprietary Track mode with an interval of 30 minutes or less, the GPS will retain its clock and ephemeris data in order
to perform a "hot" GPS fix. This will increase the sleep current by roughly 50uA in such a track mode.
If the unit is already in a track mode, and this command is sent, it will be NAK'd. To change the track rate, the "Cancel
Proprietary Track" command must be sent, and a new track command then issued.
OPERATING MODE STANDBY CURRENT
Proprietary Tracking <= 30 minute interval GPS Standby Mode
Proprietary Tracking > 30 minute interval Standby Mode
ST100 User Manual v1 Confidential & Proprietary Information 36