Proprietary Motion Activated Track" Command; Table 8 - Operating Modes & Standby Currents - Globalstar ST100 User Manual

8545-0194-01 v1.0

4.2.2.14. "Proprietary Motion Activated Track" command

This command allows the initiation of a periodic track 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. In this
mode, tracking will suspend when the accelerometer detects that the device is not moving, and then resume when it detects
that the device is moving again.
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. 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 GPS standby current to the "GPS Standby Mode" value in Table 7. For tracking intervals greater
than 30 minutes, the GPS will be powered off in between transmissions and the sleep current will be the "Standby Mode" value
in Table 7.
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.
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.
While in Motion Activated Track mode, the accelerometer sub-system will remain powered during the standby periods in
between transmissions and the accelerometer standby current will be the "Standby mode supply current w/Accelerometer"
value in Table 7. The following table summarizes the standby mode supply current for different modes.
OPERATING MODE
Continuous Tracking <= 30 minute interval
Continuous Tracking > 30 minute interval
Motion Activated Tracking <= 30 minute interval
Motion Activated Tracking > 30 minute interval
BYTE BITS
0 0 - 7
1 0 - 7
2 0 - 7
3-4 0 - 15
5 0 - 7
6 0 - 7
7 0 - 7
8 0 - 15
ST100 User Manual v1
TABLE 8 - OPERATING MODES & STANDBY CURRENTS
PROPRIETARY MOTION ACTIVATED TRACK COMMAND FORMAT
PARAMETER
Leader Always a value of 0xAA
Length 0x0A (10 decimal)
Command Code 0x34 = Initiate proprietary motion activated track
Interval in minutes between the track points. 2 to 65535 minutes. (A setting of 2 actually
Interval
results in a 2.5 minute interval, any other value results in an interval of that many minutes).
Byte 0 value The value to transmit as byte 0
Byte 7 value The value to transmit as byte 7
Byte 8 value The value to transmit as byte 8
CRC
Confidential & Proprietary Information
STANDBY CURRENT
GPS Standby Mode + Standby mode supply current w/Accelerometer
Standby mode supply current w/Accelerometer
GPS Standby Mode + Standby mode supply current w/Accelerometer
Standby mode supply current w/Accelerometer
DESCRIPTION
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