Chapter 6 – Network Service Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 31
Chapter 6 – Network Service Commands

Signal Quality +CSQ

Description: This command determines the received signal strength indication (<rssi>) and the channel bit error rate
(<ber>) with or without a SIM card inserted.
Values: <rssi>:
0 -113 dBm or less
1 -111 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
Syntax: AT+CSQ
Command Possible responses
AT+CSQ
+CSQ: <rssi>,<ber>
OK
(Note: <rssi> and <ber> as defined below)

Operator Selection +COPS

Description: There are three possible ways of selecting a Public Land Mobile Network (PLMN) operator:
• 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.
Values: <mode>
0 automatic (default value)
1 manual
2 deregistration; ME will be unregistered until <mode>=0 or 1 is selected.
3 set only <format> (for read command AT+COPS?)
4 manual / automatic (<oper> shall be present), if manual selection fails, automatic mode is
entered.
<format> <format>: format of <oper> field
0 long alphanumeric format <oper>
1 short alphanumeric format <oper>
2 numeric <oper> (default value)
<stat> Status of operator
0 unknown
1 available
2 current
3 forbidden