Sierra Wireless AirLink GL8200, User Manual

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4116298 Rev 7.0 November 07, 2016 29
Product Technical Specification and
User Guide
Communicating with the GL8200
For more information about AT commands applicable to the GL8200, please refer to the commands
marked as supported by HL8548x in document [2] AirPrime HL6 and HL8 Series AT Commands
Interface Guide.
4.4. Verify the Network Registration
To verify the GL8200
’s network registration, ensure that a valid SIM card has been inserted into the
GL8200 SIM card holder (when using Embedded SIM , verify that the device has been registered by
the network provider) and do the following:

Using a communication software such as HyperTerminal, enter the following AT commands:
AT+CPIN=”xxxx”
(to enter PIN code xxxx)
AT+CREG?
(to ascertain the registration status)
The response returned has the following format:
+CREG: <mode>,<stat>
where:
<mode>
= unsolicited registration message configuration
<stat>
= registration state

Verify the state of registration according to the returned values given in the table below.
Table 14. Network Registration Values
Returned Values <mode>,<stat> Network Registration
+CREG: 0,0
No (not registered)
+CREG: 0,1
Yes (registered, home network)
+CREG: 0,5
Yes (registered, roaming)
For more information about AT commands applicable to the GL8200, please refer to the commands
marked as supported by HL8548x in document [2] AirPrime HL6 and HL8 Series AT Commands
Interface Guide.
If the GL8200 is not registered on the network, perform the following procedures:

Check the connection between the GL8200 and the antenna.

Verify the signal strength to determine the received signal strength (refer to section 4.3 Verify
the Received Signal Strength
for more information).