Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual de usuario descargar pdf (Pagina 161)

9D. Getting Started II. SOFTWARE GUIDES - 9. Driver488/SUB

II-146 Personal488 User’s Manual, Rev. 3.0

2. If the external device name is specified with its interface name prefixed, then that external device

on that hardware interface is used. If that external device is not attached to the specified hardware

interface, then an error occurs.

Example

Assume there are three IEEE 488 interfaces:

IEEE

IEEE2

, and

IEEE3

controlling multiple devices:

SCOPE

(on

IEEE

(on

IEEE2

) and

(on

IEEE3

). Since there are two external devices, both

named

, their full name must be used to specify them.

We can communicate with the external devices, according to the two rules above.

scope = OpenName (“SCOPE”) ; // SCOPE on IEEE (Rule 1)

da = OpenName (“DA”) // DA on IEEE2 or IEEE3 (not specified)

da = OpenName (“IEEE2:DA”) ; // DA on IEEE2 (Rule 2)

scope = OpenName (“IEEE2:SCOPE”); // Error (not IEEE:SCOPE) (Rule 2)

9D. Getting Started

Topics

•

Introduction...................................................................................II-145

•

C Language ....................................................................................II-145

Required Headers........................................................................................ II-146

Required Libraries...................................................................................... II-146

•

QuickBASIC...................................................................................II-148

Required Definition File ............................................................................ II-149

Required Libraries...................................................................................... II-149

•

Pascal ..............................................................................................II-149

Required Libraries...................................................................................... II-149

Introduction

The following text outlines the steps necessary to produce an application program that communicates

with Driver488/SUB. The application is the simplest one possible, it merely requests the revision

number of the resident driver using the

Hello

command. Examples are provided in C, QuickBASIC

and Pascal. Each of these supported languages are described in more detail in each of the next three

Sub-Chapters “C Languages,” “QuickBASIC,” and “Pascal” of this Chapter. For further information

on the

Hello

command, see the “Section III: Command References” of this manual.

C Language

To successfully operate Driver488/SUB, several declarations must be included in the user’s application

program. These declarations are found in two headers which must be included in the main module of

your C program. The two required headers can be found in the language-specific subdirectory at the

end of the path

\IEEE488\SUBAPI

, if installed under the default conditions.

In the same directory as the headers, are the libraries for the different memory models. One of these

libraries must be linked with your C project to resolve Driver488/SUB external references.

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