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wibconf-Windows Interface Bus Configuration Utility Chapter 8
NI-488.2 User Manual for Windows 8-10 © National Instruments Corp.
Bus Timing (Board Characteristic Only)
This field specifies the T1 delay of the source handshake capability for the board. This
delay determines the minimum amount of time, after the data is placed on the bus, that
the board may assert DAV during a write or command operation. If the total length of
the GPIB cable length in the system is less than 15 m, the value of 350 ns is appropriate.
Other factors might affect the choice of the T1 delay, although they are unlikely to affect
your system setup. Refer to the ANSI/IEEE Standard 488.1-1987, Section 5.2, for more
information about these other factors. The default for this option is 500 ns.
Cable Length for High Speed (Board Characteristic Only)
This field specifies the number of meters of GPIB cable you have in your system. If you
use the HS488 high-speed protocol to communicate with HS488-compliant devices, you
must specify the total number of meters of GPIB cable in your system. The System
Controller, when it initializes the GPIB, must send this information to all HS488 devices
so that high-speed transfers occur without errors.
Parallel Poll Duration (Board Characteristic Only)
This field specifies the length of time the driver waits when conducting a parallel poll.
For a normal bus configuration (the Controller and devices on the same bus) use the
default duration of 2 µs. If you are using a GPIB bus extender in transparent parallel poll
mode, you should increase the poll duration to 10 µs so that the bus extender can operate
transparently to your applications.
Use This GPIB Interface (Board Characteristic Only)
If you do not want the driver to try to access a board at the selected base address (because
you do not have a board in the system), select no for this option. When this field is set to
no , the driver returns the EDVR error as soon as a program tries to access the board. By
default, access board gpib0 is enabled, and gpib1 , gpib2, and gpib3 are disabled.
Base I/O Address (Board Description Only)
This field specifies the I/O address of the GPIB board. It must be set to the same value as
the base I/O address setting for the GPIB board itself. Setting the base I/O address level
is explained in the getting started manual that you received with your GPIB interface
board.
Note : On some systems, this field is read-only and you cannot change it using
wibconf. Refer to your getting started manual for information on how
to change the I/O address.