Measurement-computing GPIB-488 Bedienungsanleitung PDF herunterladen (Seite 52)

Chapter 3 GPIB 488.1 Library Reference

GPIB-488 3-39 Programming Reference Manual

IBRPP

Initiates a parallel poll.

Syntax

C ibrpp (int boarddev, char *command)

Parameters

boarddev is an integer containing the device or board handle.

Returns

command will contain the response to the parallel poll.

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

If this routine is called specifying a GPIB Interface Board, the board parallel polls all

previously configured devices. If the routine is called specifying a device, the GPIB Interface

board associated with the device conducts the parallel poll. Note that if the GPIB Interface

Board to conduct the parallel poll is not the Controller-In-Charge, an ECIC error is generated.

Before executing a parallel poll, the

ibppc function should configure the connected devices

with

ibppc to specify how they should respond to the poll.

Example

This program configures two devices for a parallel poll. It then conducts the poll. It is assumed

that voltmeter and scope have already been set by opening the devices with an

ibfind and

board has been set by opening the board with an

ibfind.

Both devices indicate that they want service by setting their first bit to 1. The first

ibppc

specifies that the first device (

voltmeter) should drive the DIO1 line high when its first line

goes high. The second

ibppc specifies that the second device (scope) should drive the DIO2

line high when its first bit goes high. The

ibrpp conducts the poll and checks DIO1 and DIO2

to see if either device is requesting service.

C int voltmeter, scope, board, pollbyte;

ibppc (voltmeter, 0x68)

ibppc (scope, 0x69)

ibrpp (board, &pollbyte)

if (pollbyte & 1)

printf "Volt meter is requesting service"

if (pollbyte & 2)

printf "Oscilloscope is requesting service"

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