Measurement-computing GPIB-488 Instrukcja Użytkownika Pobierz pdf (Strona 68)

Chapter 3 GPIB 488.1 Library Reference

GPIB-488 3-55 Programming Reference Manual

IBWRTF

Writes data from a file to the specified device or GPIB Interface Board.

Syntax

C ibwrtf (int boarddev, char filename [])

Parameters

boarddev is an integer containing the board or device handle.

filename is the name of the file (up to 50 characters, including drive/path) to store the data.

Specify a drive and path if necessary. This file is automatically opened as a binary file.

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 found.

ibcnt, ibcntl will contain the number of bytes that were written. 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 write terminates when one of the following occurs:

• An error is detected.

• The time limit is exceeded.

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

• All data has been sent.

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

access board is addressed to listen. If

boarddev specifies a GPIB interface board, you must

have already addressed a device as a listener and the board as a talker. If the board is the CIC,

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

Example

This program sends the command "UPLOAD" to a device and prepares the device to receive a

large amount of data. The program then sends the data from a file to the device.

C int device;

ibwrt (device, "UPLOAD");

ibwrtf (device, "c:gpib.dat");

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Measurement-computing GPIB-488 Instrukcja Użytkownika Strona 68