User guide

6615-2203

… GDW-11 communicates via GPRS to another GDW-11 with TCP

socket connection. This example uses SIM cards with fixed IP

addresses.

GPRS

Network

Configure the GDW-11 with a terminal (both units)

AT+WOPEN=1 Enable Advanced mode. Modem will restart

AT+CPIN=xxxx If PIN code required

AT&F Set the unit to factory default

AT+CGATT=1 Make an attach (register) to the GPRS network

AT&W Store settings

Connect to the ISP using GPRS (both units)

AT*WGPRSAPN=”APN_Server” Set the APN server address

AT*WGPRSUN=”username” Set the APN username

AT*WGPRSPW=”password” Set the APN password

Set up the TCP server

AT*WTCPSERV=”255.255.255.255” No filter of the incoming TCP client IP address

AT*WTCPPORT=9000 Set up the TCP port (it must be the same in both units)

AT*WTCPMODE=1 Set this modem to server

Set up the TCP client

AT*WTCPSERV=”123.456.789.123” Set up the servers IP address

AT*WTCPPORT=9000 Set up the TCP port (it must be the same in both units)

AT*WTCPMODE=0 Set this modem to client

Activate the auto connect mode (both units)

AT*WTCPCONNECT=1 Activate the GPRS context

AT&W Store TCP settings

At the TCP server

Power off / on Auto connect at power on

Ok Response from the modem

Data Data flow is bidirectional (only after the client has connected)

At the TCP client

Power off / on Auto connect at power on

Ok Response from the modem

Data Data flow is bidirectional (only after the client is connected)