Westermo GDW-11 User Manual

Page 38

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

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

Response from the modem

Data

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