Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 542)

Supplementary Services Commands
Accumulated Call Meter +CACM
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WM_DEV_OAT_UGD_049 - 001 VOLUME 3 August 23, 2007
20.12.3 Parameters and Defined Values
<pin2passwd>:
Personal Identification Number 2.
8 digit number
<acm>: Accumulated Call Meter
three bytes of the current call meter value in hexadecimal format
(e.g. "00001E" corresponds to the decimal value 30). The value is
in home units and bytes are coded in a similar way as the
ACMmax value in SIM.
string type
20.12.4 Parameter Storage
None.
20.12.5 Examples
Command Responses
AT+CACM?
Note: Request ACM value
+CACM: "000400"
OK
Note: Display ACM value (ACM=1024)
AT+CACM=1234
Note: Request ACM reset, real PIN2 is "1234"
OK
Note: ACM value is reset
AT+CACM ?
Note: Request ACM value
+CACM: "000000"
OK
Note: Display ACM value (ACM = 0)