(1) Circular fence
Set a coordinate as the centre of the circular fence, and then set a distance as radius.
Go in/out fence SMS:
“FENCE,ON,0,latitude,longitude,radius#”
e.g.: FENCE,ON,0,N22.57139,E113.87710,5#
It means the radius is 500 meters（radius 1=100M，2=200M····and so on）
The device will reply “OK” if set successfully. As long as the device goes in or out of this
circular area, it will send alarm to the SOS numbers.
You can also set current location coordinates as the centre of the circular fence,
“FENCE,ON,0,0,0,radius#” (This SMS is only available when device get located)
Go in fence SMS:
Any number can send the following message”FENCE,ON,0,latitude,longitude,radius,IN#”
to turn on circular fence function
e.g.: FENCE,ON,0,N22.57139,E113.87710,5,IN#
It means the radius is 500 meters（radius 1=100M，2=200M····and so on）
The device will reply “OK” if set successfully. As long as the device goes in this circular area,
it will send alarm to the SOS numbers.
Go out fence SMS:
“FENCE,ON,0,latitude,longitude,radius,OUT#”
e.g.: FENCE,ON,0,N22.57139,E113.87710,5,OUT #
It means the radius is 500 meters.（radius 1=100M，2=200M····and so on）
The device will reply “OK” if set successfully. As long as the device goes out of this circular
area, it will send alarm to the SOS numbers.
(2) Rectangle fence
Specify two points in the map and use them as diagonal line, you can draw a rectangle area,
which is the rectangle fence.
Go in/out fence SMS:
Any number send the command “FENCE,ON,1,the latitude of upper left corner, the
longitude of upper left corner, the latitude of lower right corner, the longitude of
lower right corner#”.
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