V521 Personal GPS Tracker Instruction Manual V3.0
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11.2 Setting of square geo-fence scope
Instruction format: 006GX, IO/I/O, E/W longitude upper limit + N/S latitude upper limit, E/W longitude lower
limit + N/S latitude lower limit.
For example: 006G1,IO,E114.10004N22.55705,E115.10006N23.55706
After receiving the instruction, V521 will return confirmation message: SET SQUARE GEO-FENCE GX
(IO/I/O) OK.
Description: GX is geo-fence X, whose value range is [1, 16]. IO means warning for both outgoing and incoming
fence; I means warning for incoming fence; O means outgoing fence. Longitude and latitude value take degree as
unit. 5 digits after decimal point shall be reserved and 0 shall not be omitted.
IO means warning for both outgoing and incoming fence; I means warning for incoming fence; O means
outgoing fence.
Note: (1) After setting is completed, fence is turned on automatically. Now, default fence type is IO, i.e., warning
for both outgoing and incoming fence.
(2)
If calling status is off, message will be sent to prestored user in SMS mode instead of calling him.
(3)
Value set by the instruction is not subject to power off or switch on/off until change instruction or
restoration operation is received again.
(4)
After restoration, longitude value is indicated by 0. Fence is in shutoff status.
1>Turn on square geo-fence
Instruction format to turn on all square geo-fence: 311
For example: 311
Description: The instruction is used to turn on all square geo-fence and turn on single square geo-fence. GX
stands for geo-fence X, whose value range is [1, 16]. After receiving the instruction, V521 returns confirmation
message: SET ALL SQUARE GEO FENCE: ON.
2>Instruction to turn off square geo-fence
Instruction format to turn off all rectangular geo-fence: 310
For example: 310
I
Description: The instruction is used to turn on all rectangular geo-fence and turn on single rectangular geo-fence.
GX stands for geo-fence X, whose value range is [1, 16]. After receiving the instruction, V521 returns confirmation
message: SET ALL SQUARE GEO FENCE: OFF.
Notice: Above stated geo-fences are optional. When the device receives geo-fence setting instruction, geo-
fence function will be activated automatically. When geo-fence function is activated again after turned off,
previous setting remains valid.
13. Low battery alarm
In case of too low working voltage (electricity quantity), V521 will send position information with information
format of returned “request for single positioning” to the prestored three numbers. Information status will be updated
to STATE: LP. The information will be sent for 3 times with an interval of 1 minute.
16.
Instruction to set GPS status
Message instruction may make GPS in three statuses: on/off/self adapting. GPS is switched on when delivered
from the factory or reset.
1>Instruction to turn on GPS
Instruction format: opengps
