Specifications

Smart Machine Smart Decision
SIM900_AT Commands Manual_V1.07 244 2012.12.10
+CR: <serv>
An intermediate result code is
transmitted during connect negotiation
when the TA has determined the speed
and quality of service to be used, before
any error control or data compression
reports are transmitted, and before any
final result code (e.g. CONNECT)
appears.
AT+CR=1
+CUSD:
<m>[<str_urc>[<dcs>]]
Indicates an USSD response from the
network, or network initiated operation.
AT+CUSD=1
RING
An incoming call signal from network is
detected.
NORMAL POWER DOWN
SIM900 is powered down by the
PWRKEY pin or AT command
“AT+CPOWD=1”.
+CMTE: <n> The module temperature is abnormal.
Refer to hardware document for details.
AT+ CM TE= 1
UNDER-VOLTAGE
POWER DOWN
Under-voltage automatic power down.
UNDER-VOLTAGE
WARNNING
under-voltage warning
OVER-VOLTAGE POWER
DOWN
Over-voltage automatic power down.
OVER-VOLTAGE
WARNNING
over-voltage warning
CHARGE-ONLY MODE
The module is charging by charger.
(require hardware support)
RDY
Power on procedure is completed, and
the module is ready to operate at fixed
baud rate. (This URC does not appear
when auto-bauding function is active).
AT+IPR=<rate>
<rate> is not 0
Call Ready
Module is powered on and initialization
procedure is over.
AT+CIURC=1
+CFUN: <fun> Phone functionality indication (This
URC does not appear when
auto-bauding function is active).
AT+IPR=<rate>
<rate> is not 0
[<n>,]CONNECT OK
TCP/ UDP connection is successful AT+CIPSTART
CONNECT
TCP/UDP connection in channel mode is
successful
[<n>,]CONNECT FAIL
TCP/UDP connection fails AT+CIPSTART
[<n>,]ALREADY
CONNECT
TCP/UDP connection exists AT+CIPSTART
[<n>,]SEND OK
Data sending is successful
[<n>,]CLOSED
TCP/UDP connection is closed
RECV FROM: <IP
ADDRESS>: <PORT>
shows remote IP address and port
(only in single connection mode)
AT+CIPSRIP=1
+IPD, <data
size>,<TCP/UDP>:<data>
display transfer protocol in IP header to
received data or not (only in single
AT+ CI PHE AD
AT+CIPSHOWTP