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

Chapter 10 – Supplementary Services Commands  

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

86 

 

Description:  

The set command sets the Advice of Charge related to accumulated call meter maximum value in SIM 
file EF

ACMmax

. ACMmax contains the maximum number of home units the subscriber is allowed to 

consume. When ACM (see +CACM) reaches ACMmax, calls are prohibited. SIM PIN2 is required to set 
the value. If setting fails in an ME error, +CME ERROR: <err> is returned. 

 

The Read command returns the current value of ACMmax.  

 

The ACMmax value (entered or displayed) is in hexadecimal format with 6 digits. 

Values: 

String type coded as <ccm> under +CAOC. Value 0 disables ACMmax feature.

 

<pin2 passwd>   String type 

syntax: AT+CAMM:<ACMmax>,<pin2 passwd> 

AT+CAMM=”000400”,1234 
Note: Request ACMmax update, PIN2 is “1234” 

 OK 
Note: ACMmax updated to 1024 

AT+CAMM=”000400”,0000 
Note: Request ACMmax update, PIN2 is “1234” 

+CME ERROR: 16  
Note: Incorrect password 

AT+CAMM ? 
Note: Request ACMmax value 

+CAMM: “000400” 
OK 
Note: ACMmax = 1024 

 

 

Description: 

The set command sets the parameters for Advice of Charge related to price per unit and the currency 
table in SIM file EF

PUCT

. PUCT information can be used to convert the home units (as used in +CAOC, 

+CACM and +CAMM) into currency units. SIM PIN2 is required to set the parameters. If setting fails in 
an ME error, +CME ERROR: <err> is returned.. 

 String type  

String type 

 

<pin2 passwd>  String type 

syntax: AT+CPUC <currency>,<ppu>,<pin2 passwd>    

AT+CPUC=”FFR”,”0.82”,1234 
Note: Request Currency and Price per unit update 

 OK 
  

AT+CPUC=”FFR”,”0.82”,1111 
Note: Request Currency and PPU update (wrong PIN2)

+ CME ERROR: 16 
Note: Incorrect password 

AT+CPUC? 
Note: Request Currency and Price 

+CPUC:”FFR”,”0.82” 
OK 
Note: Currency= “FFR” 
Price per unit= “0.82”