Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 45 12/24/2010
+CACM: <acm>
OK
If error is related to ME functionality:
+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
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>
Write Command
AT+CACM=<pa
sswd>
Parameter
<passwd> string type (string should be included in quotation marks):
SIM PIN2
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
Response
TA returns the current value of ACM max.
+CAMM: <acmmax>
OK
If error is related to ME functionality:
+CME ERROR: <err>
Read Command
AT+CAMM?
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