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Multi-Tech Systems GPRS (MTMMC-G) User Manual

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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