National Instruments GPIB-PC User Manual
Page 144
Section Four A
BASICA/QuickBASIC GPIB-PC Function Calls
©National Instruments Corp.
4A-69
GPIB-PC User Manual
3.
IBCMD
sends the following commands:
•
Untalk (UNT) and Unlisten (UNL); and
•
Serial Poll Disable (SPD).
The interpretation of the response in
SPR%
, other than the
RQS bit, is device-specific. For example, the polled
device might set a particular bit in the response byte to
indicate
that it has data to transfer, and another bit to indicate a
need for reprogramming. Consult the device documentation
for interpretation of the response byte.
Refer to
IBCMD
and
IBRD
for additional information.
Device Example:
1.
Obtain the Serial Poll response (SPR) byte from the device
TAPE%
.
100 CALL IBRSP (TAPE%,SPR%)
110 REM The application program would then
120 REM analyze the response in SPR%.