Before making any WDIPterm method calls in your application, make sure to set the ServerOn property to "true".

Test For Good Communication

Implement an event handler for OnTermBaseRegister that causes a beep or displays a message when called. If communication between the host PC and the base station is good, your event handler will fire when your program is running and you power up an attached base station.

Multiple Base Stations

For installations using multiple base stations attached to a single client PC, simply use the four "channels" provided by the Client Utility program.

Terminal Tracking

Since you get only one set of event handlers, you will need some scheme for keeping track of where each terminal (up to 64 per base station, up to 4 base stations per client) is in its transaction sequence. One possible solution is to use a "state" variable for each terminal (perhaps stored in an array). Test the state variable to determine the next prompt for any given terminal. See the samples for more ideas.

It is very important to keep track of "login status" for each terminal. Every SignOut event should have an associated SignIn event and a given terminal should not be allowed to SignIn twice without and an intervening SignOut. Multiple SignIns from one terminal without appropriate SignOuts indicate either:

•A terminal going out of range and having its power cycled before returning within range OR

•Two (or more) terminals using the same ID (terminal ID conflict).

Concepts - TCP/IP COM

Drop-in components are tools that are added to your programming environment "tool kit". Only the ActiveX variety are widely compatible with almost all development environments. When you use drop-in components in your program you will follow the standard object-oriented programming paradigm that uses properties, methods, and events to implement the functionality of the drop-in component.

Properties are the various configuration variables used by the drop-in component. An example of a property is the ServerOn setting.

Methods are function calls used to issue commands and access features of the drop-in component. An example of a method is sending an Input command to the terminal.

Events are function definitions placed in your application’s source code. The function definitions in your source code are called Event Handlers. The skeleton structure of the event handler’s source code is automatically generated. The code in the Event Handler is called ("fired") by the drop-in component when a specific event occurs. An example of an event is when a terminal returns data and the OnTermData event is fired.

The details of how to access Properties/Methods/Events varies between development platforms. Details of how it works in some of the most popular platforms is illustrated in the samples included with the RF Utilities CD or available for download from our website at:

http://www.barcodehq.com/downloads.html

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Worth Data 7000 manual Concepts TCP/IP COM, Test For Good Communication
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7000 specifications

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