Specifications

Smart Machine Smart Decision
SIM900_AT Commands Manual_V1.07 254 2012.12.10
CID 1 and sets the PDP type
to IP, access point name and IP
address aren’t set.
ATD*99# CONNECT
Cancel a context using the
terminal equipment
Pause data transfer and enter
Command mode by +++
Stop the GPRS data transfer
AT+CGDCONT=1,
"IP","CMNET"
ATD*99#
+++
ATH
OK
CONNECT
OK
OK
Reconnect a context using the
terminal equipment
Resume the data transfer
AT+CGDCONT=1,
"IP","CMNET"
ATD*99#
+++
ATO
OK
CONNECT
OK
CONNECT
*Quality of Service (QOS) is a special parameter of a CID which consists of several parameters itself.
The QOS consists of
The precedence class
The delay class
The reliability class
The peak throughput class
The mean throughput class
and is decided in "requested QOS" and "minimum acceptable QOS”.
All parameters of the QOS are initiated by default to the "network subscribed value (=0)" but the
QOS itself is set to be undefined. To define a QOS use the AT+CGQREQ or AT+CGQMIN
Command.
Overwrite the precedence
class of
QOS of CID 1 and sets the
QOS of
CID 1 to be present
AT+CGQREQ=1,2 OK
Response: all QOS values of
CID 1
are set to network subscribed
except precedence class which
is set
to 2
AT+CGQREQ? +CGQREQ:1,2,,,,
+CGQREQ: 3,0,0,3,0,0
OK
Set the QOS of CID 1 to not
present.
AT+CGQREQ=1 OK