B&B Electronics 4 Channel Input Buffer Board SDAIBB Manuale Utente Scaricare il pdf (Pagina 41)

Documentation Number UD128A8D4602 Manual Chapter 5 37

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Chapter 5 -

UD PROGRAMMING WITH VISUAL BASIC

Introduction

The UD128A8D Data Acquisition Library provides access to the

hardware using the “B&B Electronics Data Acquisition Type Library

1.0” and Visual Basic Project References. Selection of the Library

enables functions for reading or writing data to the UD128A8D.

These functions are similar to those used with other devices.

The UD128A8D drivers make a collection of devices as found during

startup or connection, this collection is accessed through the

creation of global variables and objects. Provided functions include a

means to determine how many devices are connected, to select

which device is to be accessed, and to read or send data to any of

the connected devices. An event is generated when a device is

connected or disconnected. Your program must handle that event

and take appropriate action. One program at a time can access the

device collection using this version of the Library..

Devices connected can be addressed in the order in which they are

found {Device(1), Device(2), etc.} during startup or by the DAQ

name (“DAQ1”, “DAQ2”, etc.). If you plug in a new DAQ module, it is

added to the collection as the next DAQ name (“DAQ3”) and will

reserve and retain that name on that computer. If all of the devices

are disconnected, and the last module is reconnected, it will be the

first device found, Device(1), but could also be addressed by the

DAQ name (“DAQ3”). Methods are provided for either type of

module access.

The following sections covers the basics, then advanced access.

Description

The BBDaq Software Component provides an interface in Microsoft

Visual Basic to the UD128A8D. It may be expanded later to cover

other data acquisition devices with different functions.

Following is a description of the functions available using VB 6.0 for

compatibility with Windows OS versions 98 through XP.

Library Software Component Organization

(1) BDaq.BBDaqEnum

A BBDaqEnum is a collection of connected UD devices. You can

select a device from BBDaqEnum by name or reference. Connecting

or disconnecting a device causes an event that can trigger the

software to check connected devices and make appropriate

changes.

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