V521 Personal GPS Tracker Instruction Manual V3.0
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For example: sos113900000000
Description: If V521 receives the instruction and returns confirmation message “SET USER NUMBER (1-3)
OK”, then pre-stored number will be set successfully.
Clear instruction format: sos+number(1,2,3),
For example: sos1
If V521 receives the instruction it will remove the pre-store number, then reply the message “CLEAR USER
NUMBER (1-3) OK”,
Note: 1. Initial password for the device is 0000.
2.
The device can pre-store 3 telephone numbers at most.
3.
The instruction also applies to new number which covers existing number. For example, A is the
first pre-stored number. If B also sends instruction to set the first pre-stored number, number of B will substitute
number of A and become the first pre-stored number.
I.
Working mode of device
The product has the following two working modes: SMS mode (message point to point) and GPRS online mode.
1.
If the user only wants to inquire for vehicle position (longitude and latitude) with cell phone, corresponding
address on Google map, please select SMS mode.
2.
If the user wants to monitor vehicle real-time status and inquire for its historical track, please select GPRS
real-time online mode.
II.
Switchover between the two modes
The following instruction may be used to switch over between the two modes.
Message (SMS) point-to-point mode:
Instruction format: 700 (4 digits)
For example: 7000000
Description: When V521 receives the instruction, it will automatically switch to SMS mode. After success, it
will return confirmation message “SET MODE OK, CURRENT MODE: SMS P2P”.
GPRS online working mode:
Instruction format: 710 (4 digits)
For example: 7100000
Description: When V521 receives the instruction, it will automatically switch to GPRS mode. After success, it
will return confirmation message “SET MODE OK, CURRENT MODE: GPRS”.
Chapter Four Application and Operation in SMS Mode
Most instructions are operable under both SMS mode and GPRS mode unless otherwise specified.
1.
Instruction to request single positioning
Instruction format: 666
Description: When V521 receives the instruction, it will return current Google link.
Note:
1. In case of cold start and GPS is not positioned, invalid message will be returned: GPS UNAVAILABLE,
PLEASE TRYAGAIN LATER.
2.
Instruction to return Chinese address for single positioning
Instruction format 1: 667
For example: 667
