4112221
Rev 7.2
June 19, 2013
67
User Guide
Communicating with the FX Series
9.2.
Verifying the Received Signal Strength
The FX Series 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 50.
<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 FX Series. Refer to the table below for the list of main responses returned.
Table 51.
AT+CREG? Main Reponses
AT+CREG? Response
Description
AT+CREG: 0, 0
Not registered
AT+CREG: 0, 1
Registered on the home network
AT+CREG: 0, 5
Registered on a roaming network
If the FX Series is not registered on the network, do the following:
Check the connection between the FX Series and the antenna.
Verify the signal strength to determine the received signal strength (Refer to section 9.2
Verifying the Received Signal Strength).
9.4.
Checking the Band Selection
Using a communication software such as HyperTerminal, enter
AT+WMBS?
to check the band
selection of the FX Series. Refer to the table below for the list of main responses returned.
Table 52.
AT+WMBS? Main Reponses
AT+WMBS? Response
Description
AT+WMBS: 0, x
Mono band mode 850MHz is selected
AT+WMBS: 1, x
Mono band mode extended 900MHz is selected
AT+WMBS: 2, x
Mono band mode 1800MHz is selected
AT+WMBS: 3, x
Mono band mode 1900MHz is selected
AT+WMBS: 4, x
Dual band mode 850/1900MHz is selected
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