Measurement-computing GPIB-488 Manual de usuario descargar pdf (Pagina 88)

Chapter 4 GPIB 488.2 Library Reference

Programming Reference Manual 4-20 GPIB-488

SendDataBytes

Sends data to previously addressed devices.

Syntax

C SendDataBytes(int board, char data[], long count,

int eotmode)

Parameters

board is an integer which identifies the GPIB board to be used for this operation. In most

applications, this value is 0.

data is the string that contains the data which is sent to the device.

count specifies the maximum number of data bytes which are to be sent to the device.

eotmode is the flag used to signal the end of data.

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.

Usage Notes

This routine assumes that the desired GPIB listeners have already been addressed (by using

SendSetup, for example).

Val u e s f o r

eotmode are as follows:

•

NLend—Send NL (Line Feed) with EOI after last data byte.

•

DABend—Send EOI with the last data byte in the string.

•

NULLend—Do not mark the end of the transfer.

These constants are defined in the header files.

Example

In this example, GPIB board 0 sends an identification query to all previously addressed

listeners. End of data is signaled by an EOI.

C SendDataBytes (0, "*IDN?", 5, DABend)

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 115 116

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Measurement-computing GPIB-488 Manual de usuario Pagina 88