Smart Sam3W Tcp/Ip Operation; The Tcp/Ip Stack Description; Communication Sockets - Intercel Smart SAM3W User Manual

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Smart SAM3W User Guide V1.1

9 Smart SAM3W TCP/IP Operation

When the STD-Link is closed, the modem acts as a standard modem, with the default terminal speed is

115200bps, data format is 1+8+1.

When the STD link is open, the TCP/IP stack is activated as described below.

The Smart SAM3W TCP/IP stack allows the Smart SAM3W modem to act either as a standard 3G modem

(SAMMODE=0) or as a smart 3G modem. With the SAMMODE=1 or 2 the TCP/IP stack will take full control

of the Smart SAM3W and stay in GSM mode when SAMMODE=2 to allows the modem to receive GSM data

call (CSD) or automatically connect to PSD network when SAMMODE=1. Both UDP and TCP are supported,

the modem can work as a TCP client (making TCP connection) or as an TCP server (listen for TCP

connection), remote AT commands are supported on both CSD and PSD, all communications parameters

are store in FLASH can be programmed remotely over CSD, PSD or SMS, on power up the software reads

all parameters from FLASH and activates a GPSR connection, it then create an UDP and a TCP socket for

data transfer, an UDP and a TCP socket for remote AT commands, if programmed as TCP client it will try to

connect to a remote TCP server, the modem then stay in GPRS online idle state waiting for CSD call, SMS,

UDP data or TCP connection, the software maintain GPRS connectivity by the mean of IP TRACE using the

poll period programmed in FLASH. The TCP/IP stack can be update locally over the serial port or remotely

over GPRS or CSD.

TCP Data:

Socket connection allows transparent data to pass through from host computer to the modem

serial port and vice versa, this operation is similar to the GSM data communication, in TCP

server mode the socket will be disconnected after 5 minutes of no data transfer.

UDP Data:

Socket connection allows transparent data to pass through from host computer to the modem

serial port and vice versa, this operation is similar to the GSM data communication, a block

of data received from a remote UDP server will open a 2 minutes window for data to be

transfer from the serial port.

TCP AT Command:

the modem and receive its responses, socket will be disconnected after 5 minutes of no

activity, and socket also can be used for remote firmware update.

UDP AT Command:

the modem and receive its responses; socket also can be used for remote firmware update.

Socket connection allows a user from the host computer to send AT commands to

Ver1.1

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