Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 169 23.06.2010
OK
Parameter
See Write Command
Read Command
AT+CIPMUX?
Response
+CIPMUX: <n>
OK
Parameter
See Write Command
Write Command
AT+CIPMUX=<
n>
Response
OK
Parameter
<n> 0 Single IP connection
1 Multi IP connection
Reference Note
z Only in IP initial state, AT+CIPMUX=1 is effective;
z Only when multi IP connection and GPRS application are both shut
down, AT+CIPMUX=0 is effective.
8.2.2 AT+CIPSTART Start Up TCP or UDP Connection
AT+CIPSTART Start Up TCP or UDP Connection
Test Command
AT+CIPSTART=
?
Response
1) If AT+CIPMUX=0
+CIPSTART: (list of supported <mode>),(IP address range),(port range)
+CIPSTART: (list of supported <mode>),(domain name),(port range)
OK
2) If AT+CIPMUX=1
+CIPSTART: (list of supported <n>),(list of supported <mode>),(IP
address range),(port range)
+CIPSTART: (list of supported <n>),(list of supported <mode>),(domain
name),(port range)
OK
Parameters
See Write Command
Write Command
1)If single IP
connection
(+CIPMUX=0)
AT+CIPSTART=
<mode>,<IP
Response
1)If single IP connection (+CIPMUX=0)
If format is right response
OK
otherwise response
+CME ERROR <err>