National Instruments NI PXIe-1075 User Manual

Also see for Network Adapter NI PXIe-1075: User manual

National Instruments NI PXIe-1075 User Manual Manual pdf 16 page image

© National Instruments | 1-9NI PXIe-1075 User ManualPXI Local BusThe PXI backplane local bus is a daisy-chained bus that connects each peripheral slot withadjacent peripheral slots to the left and right.The backplane routes PXI Local Bus 6 between adjacent PXI slots. The left local bus 6 from slot1 is not routed anywhere and the right local bus signal from slot 18 is not routed anywhere.Local bus signals may range from high-speed TTL signals to analog signals as high as 42 V.Initialization software uses the configuration information specific to each adjacent peripheralmodule to evaluate local bus compatibility.PXI Trigger BusAll slots on the same PXI bus segment share eight PXI trigger lines. You can use these triggerlines in a variety of ways. For example, you can use triggers to synchronize the operation ofseveral different PXI peripheral modules. In other applications, one module located in thesystem timing slot can control carefully timed sequences of operations performed on othermodules in the system. Modules can pass triggers to one another, allowing precisely timedresponses to asynchronous external events the system is monitoring or controlling.The PXI trigger lines from adjacent PXI trigger bus segments can be routed in either directionacross the PXI trigger bridges. Refer to Figure 1-5 for the connectivity diagram. This allows youto send trigger signals to, and receive trigger signals from, every slot in the chassis. Static triggerrouting (user-specified line and directional assignments) can be configured throughMeasurement & Automation Explorer (MAX). Dynamic routing of triggers (automatic lineassignments) is supported through certain National Instruments drivers like NI-DAQmx.Note Although any trigger line may be routed in either direction, it cannot berouted in more than one direction at a time.Figure 1-5. PXI Trigger Bus Connectivity DiagramPXITriggerBridgePXITriggerBridgePXI Trigger Bus Segment 2 (Slots 7-12)PXI Trigger Bus Segment 1 (Slots 1-6) PXI Trigger Bus Segment 3 (Slots 13-18)0H H H H H H H H1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18