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Hardware Configuration and Installation
a PC AT computer with an AT-MXI interface, attempts a transfer that maps into the VXIbus
mainframe.
The VXI-MXI uses VMEbus request level 3 in its factory default setting, as required by the VXIbus
specification. This is suitable for most VXIbus systems. However, you can change the VXI-MXI
to use any of the other three request levels (0, 1, or 2) by changing the jumper configuration on the
jumper blocks labeled VMEbus Request Level on the front panel. You may want to change request
levels to change the priority of the VXI-MXI request signal. For more information, refer to the
VMEbus specification.
To change the VMEbus request level of the VXI-MXI, rearrange the jumpers on the pin arrays as
shown in Figure 2-11.
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VMEbus Request Level
a. Level 3 Requester (default)
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VMEbus Request Level
c. Level 1 Requester
Figure 2-11. VXI-MXI VMEbus Requester Jumper Settings
VXI-AT2023/NI-VXI ISC 386/ix Getting Started
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VMEbus Request Level
b. Level 2 Requester
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VMEbus Request Level
d. Level 0 Requester
2-20
© National Instruments Corporation
Chapter 2
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