ST 6100 - HARDWARE GUIDE
Table 6: Blockage Power Consumption (Power Profile = MobileMinBattery)
Blockage Mode Blockage Recovery
Check Interval
3 Minute
Maximum GPS
Acquisition Time
1 Minute
Maximum GPS
Acquisition Time
No Blockage - Baseline
operation with 1 report
- Baseline Operation
Power consumption as per Power
Calculator
Short Term Blockage
(First 2.3 hours of blockage)
5 to 40 minutes.
Interval starts at 5 and doubles each
attempt.
5.5 times Baseline
Medium Term Blockage
(2.3 hours to 68 hours of
blockage)
40 minutes to 24 hours.
Interval starts at 40 minutes and
doubles each attempt.
1.9 times Baseline 1.0 times Baseline
Long Term Blockage
(more than 68 hours)
24 hours 1.2 times Baseline 0.8 times Baseline
3.3.2.3 Blockage Recovery
In the battery powered profiles, a consequence of the blockage algorithm is that the longer the terminal is blocked,
the longer it takes for the terminal to detect that the blockage condition has been removed. However, an application
could use external events such as a digital input (connected to ignition) to force the terminal to force a new satellite
channel search if movement is likely to have occurred.
The satellite traffic channel check can be forced by writing any value, including the current value to the modem’s
wake-up interval. It is important that the application not write to the wake-up interval frequently, as each write will
trigger a search that consumes significant power. When the application forces a check by writing to the wake-up
interval, the terminal blockage algorithm resumes normal operation if the traffic channel is correctly received. If the
terminal cannot find the traffic channel after the search, the terminal resumes the blockage algorithm.
A satellite traffic channel check can also be forced by changing the power mode. In this case, the blockage algorithm
restarts all its timers and commences again from the beginning if traffic channels are not detected.
3.3.3 Load Dump Circuitry
The terminal's power supply input voltage range is 9 to 32 V. Above this range the load dump protection circuitry
disconnects external power so that the terminal is not damaged, up to 150V. When the input voltage drops below the
threshold, the terminal recovers, going through power on reset.
With this protection, the terminal is capable of withstanding load dumps as specified in SAE J1455 (rev JUN2006)
paragraph 4.13.2.2.1.
3.3.4 Fuse
The terminals have an internal 5 A fuse, which provides protection in the event of an internal short on the terminal.
The internal fuse cannot be reset and is not field repairable.
T406, VERSION 01
17
© ORBCOMM PROPRIETARY
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