For more information about routing and reserving PXI triggers, refer to KnowledgeBase
3TJDOND8 at ni.com/support.
Each chassis has one or more trigger buses, each with eight lines numbered 0 through 7 that
can be reserved and routed statically or dynamically. Static reservation pre-allocates a trigger
line to prevent its configuration by a user program. Dynamic reservation/routing/deallocation
is on the fly within a user program based on National Instruments APIs such as NI-DAQmx.
NI recommends dynamic reservations and routing are used whenever possible. If static
reservations are required, static reservation of trigger lines can be implemented by the user in
MAX through the Triggers tab. PXI modules dynamically configured by programs such as
NI-DAQmx will not use reserved trigger lines. This prevents the instruments from double-
driving the trigger lines, possibly damaging devices in the chassis. In the default configuration,
trigger lines on each bus are independent. For example, if trigger line 3 is asserted on trigger
bus 0, by default it is not asserted automatically on any other trigger bus.
Complete the following steps to reserve these trigger lines in MAX.
1. In the Configuration tree, click the PXI chassis branch to configure.
2. In the lower right pane, click the Triggers tab.
3. Select the trigger lines to statically reserve.
4. Click the Save button.
22 | ni.com | PXIe-1088 User Guide
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