Measurement-computing Personal488 rev.3.0 Manuel d'utilisateur télécharger pdf (Page 73)

Personal488 for Windows 95/98/Me/NT/2000

04-10-01

API Reference 6-5

CheckListener

Syntax

INT WINAPI CheckListener(DevHandleT devHandle, BYTE primary,

BYTE secondary);

devHandle

refers to either an IEEE 488 hardware interface or an external device. If

devHandle

refers to an external device, the

CheckListener

command acts on the

hardware interface to which the external device is attached.

primary

is the primary bus address to check for a Listener (

)

secondary

is the secondary bus address to check for a Listener (

). For no

secondary address, a

-1

must be specified

Returns

-1

if error

otherwise it returns a

if a listener was found at the specified address, or a

if a listener

was not found at the specified address.

Bus States

ATN

•

UNL, LAG,

(check for

NDAC

asserted)

Example

result = CheckListener(ieee,15,4);

if (result == 1)

{

printf(“Device found at specified address.\n”);

}

if (result == 0)

{

printf(“Device not found at specified address.\n”);

}

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