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Chapter 2 Installation and Configuration
© National Instruments Corporation 2-5 VXI-USB User Manual
Installing Your VXI-USB Interface Module
All kits contain a VXI-USB interface module.
To install the VXI-USB in Slot 0 of your VXI chassis, complete the
following steps:
1. Power off the chassis.
2. Verify that the backplane connector is intact and that there are no bent
or missing pins on the module.
3. Insert the VXI-USB into the chassis in Slot 0, as shown in Figure 2-2.
4. Power on the chassis.
The VXI system controllers operate certain VXI lines as required for VXI
systems. Verify that any other VXI devices with system controller
capability that are in the same chassis are not configured as system
controller.
Caution Having more than one device configured as system controller can damage the
VXI system.
For VXI systems that include VME devices, ensure that the VME devices
are not configured in the upper 16 KB (starting from 0xC000) of the A16
address space. This region is reserved for VXI device configuration
registers, which are used for initializing, configuring, and interacting with
VXI devices. The VXI-USB also uses this region for this purpose.
Note Also ensure that no VXI devices in your system are configured for logical address 0.
This is the VXI-USB logical address, which you cannot change.
Connecting Cables
Connect the USB cable to a USB connection in your host PC and to the
VXI-USB, as shown in Figure 2-2. You can use any available USB port on
the PC for each device. The VXI-USB has two external ports for devices.
You can connect any other USB devices to any available port on a
VXI-USB, but for best performance, minimize the number of USB
devices/hubs in the system. Adding to the number of devices in the tree
degrades system performance.
Note Your VXI-USB controller is a Hi-Speed USB device, which means it performs much
faster when connected to a Hi-Speed USB port as described in the USB 2.0 specification.
USB 2.0 ports are often integrated on the motherboard of current computers. National
Instruments recommends using an integrated USB 2.0 port, if available, for optimal