National Instruments NI SCXI-1336, Руководство пользователя

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Chapter 2 Using the SCXI-1129
© National Instruments Corporation 2-25 SCXI-1129 User Manual
Wire ORed
In wire ORed operation, you can make more than one module switch at the
same time. In this mode, you can connect the SCANADVD signals
together as show in Figure 2-16. By doing this, the SCANADVD lines are
ORed together so that no scan advance is issued until the last module
releases the line. When the last module releases the SCANADVD line, the
measurement device receives the signal to take a new measurement. This
method also guarantees no channel contentions while switching.
Dummy Entries
This method allows you to control multiple modules by entering dummy
entries into the scan lists of the modules. Refer to the
NI-SWITCH User
Manual section for more information. Take care when using this method to
insure that there are no bus or channel contentions when switching between
modules.