IOtech Personal488, User Manual

Page: 122 / 150

Personal488 for Windows 95/98/Me/NT/2000
04-10-01
API Reference 6-54
Status
Syntax
INT WINAPI Status(DevHandleT devHandle, IeeeStatusPT result);
devHandle refers to either an IEEE 488 interface or an external device. If devHandle
refers to an external device,
Status
acts on the hardware interface to which the
external device is attached.
result is a pointer to a Status structure.
Returns -1 if error
Bus States None
Example
result = Status(ieee,&StatusResult);
if (StatusResult.SRQ) {
printf(“We have a serial poll request”);
} else {
printf(“There is no serial poll request”);
}
See Also
GetError, SPoll
The
Status
command returns various items detailing the current state of Driver488. They are returned in
a data structure, based on the following table.
Status Item Structure
Menber Values and Description
Primary Bus Address .Primaddr
0
to
30
: Two-digit decimal number.
Service Request .SRQ
TRUE
: SRQ is asserted,
FALSE
: SRQ is not
asserted.
The Primary Bus Address (
.Primaddr
) is the IEEE 488 bus device primary address assigned to
Driver488 or the specified device. This will be an integer from
0
to
30
.
The Service Request field (
.SRQ
), as an active controller, reflects the IEEE 488 bus
SRQ
line signal. As a
peripheral, this status reflects the
rsv
bit that can be set by the
Request
command and is cleared when the
Driver488 is Serial Polled. For more details, refer to the
SPoll
command in this chapter.