National Instruments GPIB-PC - Manual (Page 177)

BASICA/QuickBASIC GPIB-PC Function Calls Section Four A
GPIB-PC User Manual 4A-102 ©National Instruments Corp.
c. Serially poll the DVM to determine if the measured data is
valid (status byte = &HC0) or if a fault condition exists
(the &H40 bit and another bit of the status byte, other than
&H80, are set).
d. If the data is valid, read 16 bytes from the DVM.
6. End the session.
The example programs that follow are based on these assumptions:
• The GPIB-PC is the designated System Active Controller of the
GPIB.
• There is no change to the GPIB-PC default hardware settings.
• The only changes made to the software parameters are those
necessary to define the device DVM at primary address 3.
• There is only one GPIB-PC in use, which is designated GPIB0.
• Its primary listen and talk addresses are &H20 (ASCII space
character) and &H40 (ASCII @ character), respectively.