V521 Personal GPS Tracker Instruction Manual V3.0
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Description: After receiving the instruction and confirming that is correct, V521 will send confirmation message
to the sender “SET GPS SAMPLING TIME AND QUANTITY OK”.
Note: 1. Sampling time T takes second as unit, whose defined domain is [10, 59999]. Uploaded data number N for
each time has a defined domain of [1, 50].
4
Phone upload
Description:
When one of the three prestored phone numbers calls in and is hung up after ringing for 2-5 times,
it will operate as “immediately upload current position” . Status prompt is CALL.
5.
Emergency upload
Description: Press SOS key for more than 3 seconds, and the device will operate as “instruction to immediately
upload current position”; the status indicates SOS. At the same time, it will call the first prestored number. If it fails
(the phone is turned off or cannot be connected), the second and the third phone number will be called in sequence.
Note: If calling status is off, it will send position message to the server instead of calling the phone.
6.
Low voltage upload
If working voltage of V521 is lower than set value, and the device will operate as “instruction to immediately
upload current position” and add “LP” auxiliary attribute into data status to show current status. The information will
be sent for 3 times with an interval of 1 minute.
7.
Instruction to change time zone setting in GPRS mode
Instruction format: 897 + D + NN
For example: 897E08
Description: After receiving the instruction, V521 will return confirmation message: TIME ZONE SET
OK,CURRENT
：
DN
（
For example: TIME ZONE SET OK,CURRENT
：
E8
）
.
Note 1. D takes E or W to indicate east or west time zone. NN takes a 2-digit number (1-12) to indicate time
zone number.
2.
If successes to set 897E08, GPRS data upload time will be GPS time plus 8. If successes to set
897W07, GPRS data upload time will be GPS time minus 7.
3.
Default value is Greenwich time (UTC).
4.
The instruction is available for data upload in GPRS mode only.
