Owner`s manual

Chapter 3: Operational Theory
Before you jump in and start writing a complex host program, it is a good idea to be familiar with the theory
behind the operation of your 7802 RF Terminal.
System Components
The essential parts of the 7802 WiFi Terminal system are
• One or more 7802 Terminals
• One or more Access Points, mobile or on a LAN, with Internet access
and
• The Connection Host software running on a Web Server
• And an Application Server running on a Windows computer with Internet access
or
• The Connection Host program running on a Windows computer on your LAN
• And an Application Server running on a Windows computer with LAN access (can be the same
computer running the Connection Host program)
or
• A “Cloud” web-based application server (no Connection Host required)
All communication between the parts of the 7802 Terminal system is through standard TCP/IP connections
over your ethernet LAN/WAN.
The 7802 Terminals require a standard wireless access point. This can be a wireless access point installed on
your LAN, a public “hot-spot”, a mobile (cellular) access point, etc.
The Application Server is a user-written program built using the WD7802term ActiveX control that runs on
a Windows computer with Internet access. It is also possible to create your own Application Server without
using the ActiveX control, but this is challenging and requires advanced programming skills.
The Connection Host program is the “hub” of the system. It serves as a relay and brokers information flow
between the Terminals and the Application Server. All Terminals and the Application Server connect to the
Connection Host over the Internet. The Connection Host is a program provided by Worth Data that can run
on a standard Windows computer or as a PHP script on a standard Web hosting server (Apache, IIS, etc.).
There is also the default Connection Host, that is already running and provided by Worth Data, that is
located at http://www.worthdata.net
A “Cloud” web-based application is also possible by writing an application server that resides on a web
server. A web-based application server does not require a Connection Host. Worth Data provides a working
demo of this along with full source code, in fact your Terminal's default settings are for this located at
http://www.worthdata.net/server
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