User guide

WA_DEV_FEX20_UGD_002 Rev 004 March 08, 2011 80
Fastrack Xtend User Guide
Communicating with the Fastrack
Xtend
AT Command
Description
ATH
To hang up (end of call).
* When using Firmware version R7.44 or later, this command will respond with “SIERRA WIRELESS
EMBEDDED MODULE” when the serial link is OK.
For more information about these AT Commands and their associated parameters, refer to document
[7] Firmware 7.4a AT Commands Manual (Sierra Wireless Software Suite 2.31)/Firmware 7.4 AT
Commands Manual (Sierra Wireless Software Suite 2.30).
9.2. Verifying the Received Signal Strength
The Fastrack Xtend only establishes a call if the received signal strength is strong enough. Using a
communication software such as HyperTerminal, enter AT+CSQ to check the received signal
strength. The response returned will follow the format +CSQ: <rssi>, <ber>
where: <rssi> = received signal strength indication, and <ber> = channel bit error rate.
Refer to the table below for the description of the <rssi> values returned.
Table 63. <rssi> Value Description
<rssi> Value
Description
0 – 10
Received signal strength is insufficient.
11 – 31
Received signal strength is sufficient.
32 – 98
Not defined.
99
No measure available.
9.3. Verifying the Network Registration
Using a communication software such as HyperTerminal, enter AT+CREG? to verify the network
registration of the Fastrack Xtend. Refer to the table below for the list of main responses returned.
Table 64. AT+CREG Main Reponses
AT+CREG Response
Description
+CREG: 0, 0
Not registered.
+ CREG: 0, 1
Registered on the home network.
+ CREG: 0, 5
Registered on a roaming network.
If the Fastrack Xtend is not registered on the network, do the following:
 Check the connection between the Fastrack Xtend and the antenna.
 Verify the signal strength to determine the received signal strength (Refer to section 9.2
Verifying the Received Signal Strength).
Refer to document [7] Firmware 7.4a AT Commands Manual (Sierra Wireless Software Suite
2.31)/Firmware 7.4 AT Commands Manual (Sierra Wireless Software Suite 2.30) for more information
regarding the AT+CREG AT Command, and other AT commands relating to network registration in
GPRS mode.