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

Chapter 13 – Specific AT Commands  

Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 

137 

 

Description: 

Use this command to select the  GSM bands on which the modem will work. This command is allowed 
only if the selected bands are supported.  

You can choose whether the change is immediate or not: 

• 

Either the modem has to be reset to take this change into account (this is the default) 

• 

or the GSM stack restarts immediately on the specified band(s). In this mode, the command 
+WMBS is forbidden during the initialization phase of the modem and during calls. 

frequency band configuration to be supported 

0   

mono-band mode 850 MHz 

1   

mono-band mode 900 MHz 

2   

mono-band mode 1800 MHz 

3   

mono-band mode 1900 MHz 

4   

dual-band mode 850/1900 MHz 

5 

dual-band mode 900E (extended) /1800 MHz 

6 

dual-band mode 900E (extended) /1900 MHz 

<Param>  indicates the type of change 

0 

the modem will have to be reset in order to start on the specified band(s). <ResetFlag> is set 
to 1. 

1 

the change is effective immediately. The GSM stack is restarted with the specified band(s). 

<ResetFlag> stays at 0. This mode is forbidden whil in communication and during modem 
initialization. 

Note:  If <Param> is not given, the modem has to be reset to start on the specified band(s), as for 

<param>=0. 

0   

the feature was not modified since the last boot of the product 

1   

the feature has been modified since the last boot of the product; it has to be reset in order to 

take the modification into account. This is the case when the band was changed with 
“AT+WMBS=<band>” or “AT+WMBS=<band>,0” 

Command Syntax:  AT+WMBS=<Band>[,<param>] 

Response Syntax:  +WMBS: <Band>,<ResetFlag>   

 

AT+WMBS=<Band> OK 

Note: The modem has to reset for the change to be effective 

AT+WMBS=<Band>,0 OK 

Note: The modem has to reset for the change to be effective 

AT+WMBS=<Band>,1 OK 

Note: Band mode selected and GSM stack restarted 

AT+WMBS=<Band> 
 

+CME ERROR: 3 
Note: Band not allowed 

AT+WMBS? +WMBS:<Band>,<ResetFlag> 

OK 
Note: Current selected band mode is returned. 

AT+WMBS=? WMBS: 

(0,3,4),(0-1) 

OK 
Note: Only 850 mono-band or 850/1900 bi-band are available 

AT+WMBS=? 
 

WMBS: (01,2,3,4,5,6),(0-1) 
OK 
Note: All bands are available