Specifications

SIM900 AT Command Manual
SIM900_AT Command Manual_V1.03 173 12/24/2010
OK
Parameters
See Write Command
Response
1) For single IP connection (+CIPMUX=0)
+CIPSEND:<size>
OK
2) For multi IP connection (+CIPMUX=1)
+CIPSEND:<n><size>
OK
Read Command
AT+CIPSEND?
Parameters
<n> a numeric parameter which indicates the connection number
<size> a numeric parameter which indicates the data length sent at a
time
Write Command
1) If single IP
connection
(+CIPMUX=0)
AT+CIPSEND=<
length>
2) If multi IP
connection
(+CIPMUX=1)
AT+CIPSEND=<
n>[,<length>]
Response
This Command is used to send changeable length data
If single IP is connected (+CIPMUX=0)
If connection is not established or module is disconnected:
If error is related to ME functionality:
+CME ERROR <err>
If sending is successful:
When +CIPQSEND=0
SEND OK
When +CIPQSEND=1
DATA ACCEPT:<length>
If sending fails:
SEND FAIL
If multi IP connection is established (+CIPMUX=1)
If connection is not established or module is disconnected:
If error is related to ME functionality:
+CME ERROR <err>
If sending is successful:
When +CIPQSEND=0
<n>,SEND OK
When +CIPQSEND=1
DATA ACCEPT:<n>,<length>
If sending fails:
<n>,SEND FAIL