Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 173 23.06.2010
Parameters
<n> a numeric parameter which indicates the connection number
<length> a numeric parameter which indicates the length of sending
data, it must less than <size>
Reference Note
z The data length which can be sent depends on network status.Set the
time that send data automatically with the Command of AT+CIPATS.
z Only send data at the status of established connection.
8.2.4 AT+CIPQSEND Select Data Transmitting Mode
AT+CIPQSEND Select Data Transmitting Mode
Test Command
AT+CIPQSEND
=?
Response
+CIPQSEND: (0,1)
OK
Parameter
See Write Command
Read Command
AT+CIPQSEND
?
Response
+CIPQSEND: <n>
OK
Parameter
See Write Command
Write Command
AT+CIPQSEND
=<n>
Response
OK
Parameter
<n> 0 Normal mode – when the server receives TCP data, it will
response SEND OK
1 Quick send mode – when the data is sent to module, it will
response DATA ACCEPT:<n>,<length>, while not response
SEND OK
Reference Note
8.2.5 AT+CIPACK Query Previous Connection Data Transmitting State
AT+CIPACK Query Previous Connection Data Transmitting State
Test Command
AT+CIPACK=?
Response
OK
Execution
Command
Response
+CIPACK: <txlen>, <acklen>, <nacklen>