Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 171 12/24/2010
OK
Parameters
See Write Command
Response
1)If single IP connection (+CIPMUX=0)
If format is right response
OK
otherwise response
If error is related to ME functionality:
+CME ERROR <err>
Response when connection exists
ALREADY CONNECT
Response when connection is successful
CONNECT OK
Otherwise
STATE: <state>
CONNECT FAIL
2)If multi-IP connection
(+CIPMUX=1)
If format is right
OK,
otherwise response
If error is related to ME functionality:
+CME ERROR <err>
Response when connection exists
<n>,ALREADY CONNECT
If connection is successful
<n>,CONNECT OK
Otherwise
<n>,CONNECT FAIL
Write Command
1)If single IP
connection
(+CIPMUX=0)
AT+CIPSTART=
<mode>,<IP
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>
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