Measurement-computing GPIB-488 Manual do Utilizador descarregar pdf (Página 50)

Chapter 3 GPIB 488.1 Library Reference

GPIB-488 3-37 Programming Reference Manual

IBRDF

Reads data from the GPIB into a file.

Syntax

C ibrdf (int boarddev, char filename [])

Parameters

boarddev is an integer containing the board or device handle.

filename is the name of the file (up to 250 characters, including drive/path) in which the data

is to be stored. Be certain to specify a drive and path if necessary. This file is automatically

opened as a binary file. It is created if it does not already exist.

Returns

ibsta will contain a 16-bit status word as described in Appendix B, IBSTA.

iberr will contain an error code, if an error occurred. An EFSO error is generated if the file

can not be opened, created, found, written to, or closed.

ibcnt, ibcntl will contain the number of bytes that were read. ibcnt is a 16-bit integer.

ibcntl is a 32-bit integer. If the requested count was greater than 64 K, use ibcntl instead

ibcnt.

Usage Notes

A read terminates when one of the following occurs:

• The allocated buffer becomes full.

• An error is detected.

• The time limit is exceeded.

• A terminator (or EOI) is detected.

• A DCL or SDC command is received from the Active Controller.

boarddev specifies a device, the specified device is addressed to talk and its associated

access board is addressed to listen.

boarddev specifies a GPIB Interface board, you must have already addressed a device as

a talker and the board as a listener. If the board is the Active Controller, it unasserts ATN in

order to receive data. This routine leaves the board in that state.

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