Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 170 23.06.2010
address>,<port>
Or
AT+CIPSTART=
<mode>,<domai
n name>,<port>
2)If multi-IP
connection
(+CIPMUX=1)
AT+CIPSTART=
<n>,<mode>,<ad
dress>,<port>
AT+CIPSTART=
<n>,<mode>,<do
main name>,
<port>
If connection exists, response
ALREADY CONNECT
If connected successfully response
CONNECT OK
Otherwise
STATE: <state>
CONNECT FAIL
2)If multi-IP connection
(+CIPMUX=1)
If format is right response
OK,
otherwise response
+CME ERROR <err>
If connection exists, response
<n>,ALREADY CONNECT
If connected successfully response
<n>,CONNECT OK
Otherwise
<n>,CONNECT FAIL
Parameters
<n> 0..7 a numeric parameter which indicates the connection
number
<mode> a string parameter(string should be included in quotation
marks) which indicates the connection type
“TCP” Establish a TCP connection
“UDP” Establish a UDP connection
<IP address> a string parameter(string should be included in quotation
marks) which indicates remote server IP address
<port> remote server port
<domain name> a string parameter(string should be included in quotation
marks) which indicates remote server domain name
<state> a string parameter(string should be included in quotation
marks) which indicates the progress of connecting
0 IP INITIAL
1 IP START
2 IP CONFIG
3 IP GPRSACT
4 IP STATUS
5 TCP CONNECTING/UDP CONNECTING/
SERVER LISTENING
6 CONNECT OK
7 TCP CLOSING/UDP CLOSING