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Chapter 3 Configuration and Installation
© National Instruments Corporation 3-27 VXI-MXI User Manual
• If interlocked mode is used, the VXI-MXIs must be the highest priority VMEbus requesters
in their mainframe. However, one, and only one, mainframe in the MXIbus link can have a
higher priority VMEbus requester than its VXI-MXIs.
• The first and last MXIbus devices in the MXIbus link must be terminated.
• No two devices in your VXIbus/MXIbus system can have the same logical address.
After you verify the termination networks, switches, and jumpers, record all settings on the
VXI-MXI Hardware and Software Configuration Form in Appendix F, Customer
Communication. You are now ready to install the VXI-MXI. Following are general instructions
for installing your VXI-MXI in your VXIbus mainframe. Consult the user manual or technical
reference manual of your VXIbus mainframe for specific instructions and warnings.
1. Remove power from the mainframe.
2. Remove or open any doors or covers blocking access to the mainframe slots.
3. If the VXI-MXI will be installed in a D-size mainframe, install a support designed for
installing C-size cards in D-size mainframes.
4. Insert the VXI-MXI into the slot of the mainframe by aligning the top and bottom of the card
with the card guides inside the mainframe. Slowly push the VXI-MXI straight into the slot
until it seats in the backplane receptacles. The front panel of the VXI-MXI should be even
with the front panel of the mainframe.
5. Tighten the retaining screws on the top and bottom edges of the front panel.
6. Check installation.
7. Connect MXIbus and SMB cables as required.
8. Replace or close any doors or covers to the mainframe.
9. Restore power to the mainframe.
Connecting the INTX Cable
For VXI-MXIs with the INTX daughter card option, you must use special INTX cables for
routing the additional VMEbus and VXIbus signals to other frames. The INTX cable provides
either a straight point to point link (National Instruments part number 180980-XX where XX is
the length in meters) or a single connector to dual connector link (National Instruments part
number 180982-XX, where XX is the length in meters), which gives you the ability to connect
more than two devices together.
Notice that while the MXIbus is a prioritized daisy-chain, INTX signals are bused to every
device and no priority exists. Like the MXIbus, however, INTX cables must be connected in a
daisy-chain fashion to prevent impedance discontinuities from stubs that are created in a star-
type configuration.
Secure the INTX cable(s) on the back of the INTX connector using the captive screw elements to
ensure that the cable(s) will not accidentally become disconnected.