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developed well within the user layer, it will not be necessary to use any kernel level driver

development kits. However, some operating systems may draw this line at other points.

The TR122 API library contains code which performs the most difficult functions

required to operate the instrument and exposes to the layer above a comprehensible set of calls

which perform abstract functions related to a transient recorder and specific TR122 hardware.

The API is provided as a dynamic link library (DLL) written in the C programming language.

This is where the bulk of the TR122 software is located and is the primary subject of this section

of the manual. The API is designed to relieve the top level application from even the most

rudimentary house keeping duties. When the library has been successfully loaded by a top level

user application, the TR122 will be configured, calibrated, and ready for use.

The top level user application is left with very little substantial work to do. This is the

layer which provides all the fancy features – the buttons, lights, dialogs, and message boxes. In

the TR122 turnkey software package, the top layer is written in Microsoft Visual Basic 6 (VB).

It could have as well been written in National Instruments LabView, Borland Delphi, Microsoft

C, or any other environment which can access a dynamic link library as an API. The source code

for this application is included in the distribution but is not discussed in this manual. It may be

instructive to review the source code in the Visual Basic environment. The program begins by

loading the main form, aptly called Form1, which will automatically load the API library.

DDC TR122 User Manual

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