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Chapter 3 Configuration and Installation
© National Instruments Corporation 3-25 VXI-MXI User Manual
networks are not used, you should leave these internal terminators in place. If the VXI-MXI is
not going to be an end device, or if you will be using external terminators, remove the
terminating resistor networks from their sockets and store them in a safe place in case the
MXIbus system changes.
Figure 3-21 shows the position of the six MXIbus terminating networks. All six MXIbus
networks must be either installed or removed from their sockets. Figure 3-21 also shows the
INTX terminating networks for VXI-MXIs that include the INTX daughter card option.
Figure 3-21. MXIbus Terminating Networks
INTX Termination
If your VXI-MXI includes the INTX daughter card option, you must follow much the same
procedure for termination as for the MXIbus terminators. The INTX bus requires termination
networks at the first and last devices in the INTX chain. These terminations minimize reflections
caused by impedance discontinuities at the ends of the cables and bias the signal lines to their
unasserted state when they are not driven. The INTX daughter card comes with terminating
resistors installed, as shown in Figure 3-21 along with the MXIbus termination resistors.