Rainbow-electronics GT863-PY Manual de usuario descargar pdf (Pagina 25)

GT863-PY Terminal Product Description

80269ST10026a Rev. 0 - 27/09/06

3 Software Features

3.1 Enhanced EASY GPRS Extension

3.1.1 Overview

The EASY GPRS feature allows a user of the Telit GT863-PY to contact a device in the Internet

and establish with it a raw data flow over the GPRS and Internet networks.

This feature can be seen as a way to obtain a "virtual" serial connection between the Application

Software on the Internet machine involved and the controller of the Telit GT863-PY, regardless of

all the software stacks underlying.

An example of the protocol stack involved in the devices is reported:

This particular implementation allows to the devices interfacing to the Telit GT863-PY the use of

the GPRS and Internet packet service without the need to have an internal TCP/IP stack since this

function is embedded inside the module.

The new Enhanced version of the EASY GPRS overcomes some of the known limitations of the

previous implementation and implements some new features such as:

• Keep the GPRS context active even after the closing of a socket, allowing the application to

keep the same IP address;

• Also Mobile terminated (incoming) connections can be made, now it is possible to receive

incoming TCP connection requests;

• A new internal firewall has been implemented in order to guarantee a certain level of security

on internet applications.

Remote

Controller Device

Device (Internet)

Local Remote

Application Application

TCP/UDP

EASY EASY TCP/UDP

GPRS GPRS

IP IP IP IP

Serial Data

Line on

Driver Board

L2 L2

V.24 V.24

L1 L1

Telit

GT863-PY networks

Firewall

<<<---------------------------------- Virtual Serial link ---------------------------------->>>

network interworking

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Rainbow-electronics GT863-PY Manual de usuario Pagina 25