Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 47 23.06.2010
+CME ERROR: <err>
Parameter
<acm> string type (string should be included in quotation
marks); three bytes of the current ACM value in
hexa-decimal format (e.g. "00001E" indicates
decimal value 30)
000000 – FFFFFF
Write Command
AT+CACM=<pa
sswd>
Parameter
<passwd> string type (string should be included in quotation
marks):
SIM PIN2
Response
TA resets the Advice of Charge related accumulated call meter (ACM)
value in SIM file EF (ACM). ACM contains the total number of home
units for both the current and preceding calls.
OK
If error is related to ME functionality:
+CME ERROR: <err>
Reference
GSM 07.07 [13]
Note
3.2.2 AT+CAMM Accumulated Call Meter Maximum (ACM max) Set or Query
AT+CAMM Accumulated Call Meter Maximum(ACM max) Set or Query
Test Command
AT+CAMM=?
Response
OK
Parameters
Read Command
AT+CAMM?
Response
TA returns the current value of ACM max.
+CAMM: <acmmax>
OK
If error is related to ME functionality:
+CME ERROR: <err>
Parameters
see Write Command
Write Command
AT+CAMM=<ac
mmax>[,<passwd
>]
Response
TA sets the Advice of Charge related accumulated call meter maximum
value in SIM file EF (ACM max). ACM max contains the maximum
number of home units allowed to be consumed by the subscriber.
OK
If error is related to ME functionality:
+CME ERROR: <err>
ERROR