Measurement-computing Personal488 rev.3.0 Uživatelský manuál Strana 73

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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 (
00
to
30
)
secondary
is the secondary bus address to check for a Listener (
00
to
31
). For no
secondary address, a
-1
must be specified
Returns
-1
if error
otherwise it returns a
1
if a listener was found at the specified address, or a
0
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”);
}
See Also
FindListener, BusAddress
The
CheckListener
command checks for the existence of a device on the IEEE 488 bus at the specified
address.
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