Vmebus Request Level Selection; Figure 2-10. Logical Address Selection - National Instruments VXI-AT2023 Getting Started

Chapter 2
Do not change the logical address of the VXI-MXI unless you are connecting multiple VXI-MXIs
to the MXIbus. In this case, refer to the VXI-MXI User Manual that came with your additional VXI-
MXIs for more information. You can change the logical address of the VXI-MXI by changing the
setting of the 8-bit DIP switch labeled LOGICAL ADDRESS SWITCH on the front panel. The ON
position on the DIP switch corresponds to a logic value of 0, and the OFF position corresponds to a
logic value of 1. Verify that the VXI-MXI does not have the same logical address as any other
statically configured VXIbus device in your system. Remember that logical addresses hex 0 and FF
are not allowed for the VXI-MXI.
Figure 2-10 shows switch settings for logical address hex 1 and C0.

VMEbus Request Level Selection

The VXI-MXI uses one of the four VMEbus request levels to request use of the VME Data Transfer
Bus (DTB). The VXI-MXI requests use of the DTB whenever an external MXIbus device, such as
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LOGICAL ADDRESS
SWITCH
OFF ON
1
Shown at
2
Default setting
3
of Logical Address 1
4
5
6
7
8
a. Switch Setting to Default Setting Logical Address
LOGICAL ADDRESS
SWITCH
OFF ON
1
Shown at
2
Default setting
3
of Logical Address 1
4
5
6
7
8
b. Switch Set to Logical Address hex C0

Figure 2-10. Logical Address Selection

2-19
Hardware Configuration and Installation
Push this side down for logic 0
Push this side down for logic 1
Push this side down for logic 0
Push this side down for logic 1
VXI-AT2023/NI-VXI ISC 386/ix Getting Started