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SIM900 AT Command Manual

SIM900_AT Command Manual_V1.03 171 12/24/2010

Parameters

See Write Command

Response

1)If single IP connection (+CIPMUX=0)

If format is right response

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>

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

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