Measurement-computing GPIB-488.2 Uživatelský manuál stáhnout pdf (Strana 25)

GPIB 488.2 Porting Guide 986992 IOtech to Associated MCC APIs 3-7

IOtech GPIB Command Associated MCC GPIB 488.2 Command

ControlLine TestSRQ

Limited functionality

Syntax

ControlLine INT WINAPI ControlLine(DevHandleT devHandle);

TestSRQ TestSRQ(int board, short *result)

Usage Notes

ControlLine, no longer to be used. The ControlLine command could only be used only

on IEEE 488 devices. This command returned the status of the IEEE 488 bus control lines as

an 8-bit unsigned value (bits 2 and 1 were reserved for future use), as indicated in the table.

Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1

EOI SRQ NRFD NDAC DAV ATN 0 0

TestSRQ Is used to evaluate state of the SRQ line. TestSRQ does not alter the state of the

SRQ line. In the example, we test to see if SRQ is asserted.

Example:

Short result;

TestSRQ (0, &result);

if (result == 1)

{ /* SRQ is asserted */}

else

{ /* No SRQ at this time */}

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Measurement-computing GPIB-488.2 Uživatelský manuál Strana 25