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OnCell G2150I AT Command Set Network Service Commands
5-2
Signal Quality: +CSQ
Description: This command is used to ascertain the received signal strength indication (<rssi>)
and the channel bit error rate (<ber>) with or without a SIM card inserted.
Command syntax: AT+CSQ
Command Possible responses
AT+CSQ +CSQ: <rssi>,<ber>
OK
Note: <rssi> and <ber> as defined below
Defined values:
<rssi>:
0 13 dBm or less
1 11 dBm
2 to 30 -109 to –53 dBm
31 -51dBm or greater
99 not known or not detectable
<ber>:
0…7 as RXQUAL values in the table GSM 05.08
99 not known or not detectable
Operator Selection: +COPS
Description: There are three possible ways of selecting an operator (PLMN):
• The product is in manual mode. It then tries to find the operator specified by the
application and if found, tries to register.
• The product is in automatic mode. It then tries to find the home operator and if found,
tries to register. If not found, the product automatically searches for another network.
• The product enters into manual/automatic mode, and then tries to find an operator as
specified by the application (as in manual mode). If this attempt fails, it enters
automatic mode. If this is successful, the operator specified by the application is
selected. The mobile equipment then enters into automatic mode.
Note: The read command returns the current mode and the currently selected operator. In manual
mode, this PLMN may not be the one set by the application (as it is in the search phase).
These commands are not allowed during communication.
Command syntax: To force an attempt to select and register on a network, the application must
send the following command:
Command syntax: AT+COPS=<mode>, [<format> [ , <oper> ] ]
Possible responses for AT+COPS=<mode>:
ERROR Responses Meaning
OK Network is selected with full service
+CME ERROR: 30 No network service
+CME ERROR: 32 Network not allowed – emergency calls only
+CME ERROR: 3 Not allowed during Communication
+CME ERROR: 4 Incorrect parameters
+CME ERROR: 527 Please wait, and retry your selection later
+CME ERROR: 528 Location update failure – emergency calls only
+CME ERROR: 529 Selection failure – emergency calls only
+CME ERROR: 546 Emergency call is not allowed without SIM