Measurement-computing GPIB-488 Manual de usuario descargar pdf (Pagina 70)

Chapter 4 GPIB 488.2 Library Reference

Programming Reference Manual 4-2 GPIB-488

AllSpoll

Performs a serial poll on specified devices.

Syntax

C AllSpoll (int board, short addresslist[],

short resultlist[])

Parameters

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

applications, this value is 0.

addresslist is an array of GPIB addresses, terminated by the value NOADDR. These

addresses identify the devices to be serial polled.

Returns

resultlist is an array which contains the results of the serial poll. Once a device has been

serial polled, the results of the serial poll are stored in the corresponding element of

resultlist.

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

iberr will contain an error code, if an error occurred. If a device times out, iberr contains

Error 6 –

EABO (see Appendix C, IBERR), and ibcnt contains the index of the timed-out

device.

Usage Notes

To poll only one GPIB device, use ReadStatusByte.

Example

This example serial polls two devices (GPIB address 6 and 7) connected to GPIB board 0.

C short addresslist[3] = {6,7,NOADDR};

short resultlist[2];

AllSpoll (0, addresslist, resultlist);

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Measurement-computing GPIB-488 Manual de usuario Pagina 70