Chapter 6
NI-VXI Configuration Utility
©
National Instruments Corporation
6-7
Bus Configuration Editor
This section describes the options you can select for each of the fields in the
Bus Configuration Editor.
MXI Bus
The following paragraphs describe the options for the MXI Bus portion of
this editor.
MXI System Controller
You can use the MXI System Controller option to determine whether the
PCI-MXI-2 acts as the MXIbus System Controller. The three options are
Auto, Yes, and No.
When the Auto setting is active (the default setting), the PCI-MXI-2
automatically can sense from the MXIbus cable whether it should be
the controller. This setting requires that the cable is attached properly
before making any NI-VXI function calls or attempting to use the
VXI/VME-MXI-2 Configuration Editor. Refer to Connect the MXIbus
Cable at the end of either Chapter 3,
, of this manual.
You can select the Yes or No options to manually determine whether the
PCI-MXI-2 should be the MXIbus System Controller. You must still be
certain to cable the MXIbus system appropriately when you make either of
these selections.
Note
Make sure the MXI-2 cable is connected to the PCI-MXI-2 when you power on or
reboot the computer. This is required for the PCI-MXI-2 to automatically detect whether it
will be the MXIbus System Controller.
MXI Bus Timeout
The MXIbus Bus Timeout (BTO) is a watchdog timer for transfers on the
MXIbus. The MXIbus BTO operates only when the PCI-MXI-2 is acting
as the MXIbus System Controller.
After the specified amount of time has elapsed, the BTO circuitry
terminates a MXIbus cycle if no slave has responded. The BTO is also
disabled when the current MXIbus cycle maps to the VXI/VMEbus through
a VXI/VME-MXI-2.
