Measurement-computing GPIB-488 Manuel d'utilisateur télécharger pdf (Page 13)

Chapter 2 Programming with the GPIB Library

Programming Reference Manual 2-4 GPIB-488

Global Variables

The following global variables are used in all programming languages:

ibsta Status Word

iberr Error Codes

ibcnt, ibcntl Count Variables (short/long)

The

iberr variables are briefly explained here. For additional information

about

iberr, refer to Appendix C, IBERR.

For additional information about

ibcnt and ibcntl, refer to the routines

which return them.

iberr—The Error Variable

If a GPIB error occurs during a routine, its corresponding error code is

returned into the variable

iberr. Possible error codes and their meanings

are listed in Appendix C, IBERR.

ibcnt and ibcntl—Count Variables

These variables contain an integer which describes how many bytes were

actually transferred during a read or write operation.

ibcnt is an integer

value (16-bits wide) and

ibcntl is a long integer value (32-bits wide).

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Measurement-computing GPIB-488 Manuel d'utilisateur Page 13