MTD2000 AT Command Guide R12
Confidential
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For border crossing, user can place two SIM cards (e.g. SIM 1 for home country, SIM 2
for foreign country) into the device and set the dual SIM setting to auto switch mode.
The device will switch over to SIM 2 when crossing from home to foreign country and
vice-versa.
Syntax
Command
Response
AT$SIM=<Mode>
Note: Write setting.
OK
AT$SIM?
Note: Query setting.
$SIM: <Mode>
Parameters
Mode
0 – Auto switch to another SIM when roaming take place or current
network connection is down (GSM/GPRS down or TCP/UDP
connection down)
1 – Select SIM1 for GSM registration (default setting)
2 – Select SIM2 for GSM registration
Example
Command
Response
AT$SIM=0
Note: Switch over to another SIM when roaming
takes place or current network connection is down.
OK
AT$SIM=2
Note: Select SIM2 for GSM registration.
OK
21.3 Panic Button – AT$PB
This command will get the status of the panic button.
Syntax
Command
Response
AT$PB or AT$PB?
Note: Get panic button status.
OK
$PB: <Status>
