National Instruments PXI-1031 User Manual

Also see for PXI-1031DC: Installation guide User manual User manual User manual Installation guide

National Instruments PXI-1031 User Manual Manual pdf 17 page image

Chapter 1 Getting StartedNI PXI-1031/PXI-1031DC User Manual 1-8 ni.comFigure 1-5. PXI Star Trigger and Local Bus RoutingTrigger BusAll slots share eight PXI trigger lines. You can use these trigger linesin a variety of ways. For example, you can use triggers to synchronizethe operation of several different PXI peripheral modules. In otherapplications, one module located in slot 2 can control carefully timedsequences of operations performed on other modules in the system.Modules can pass triggers to one another, allowing precisely timedresponses to asynchronous external events the system is monitoringor controlling.System Reference ClockThe PXI-1031/PXI-1031DC supplies the PXI 10 MHz system clock signal(PXI_CLK10) independently to each peripheral slot. An independentbuffer (having a source impedance matched to the backplane and a skew ofless than 1 ns between slots) drives the clock signal to each peripheral slot.You can use this common reference clock signal to synchronize multiplemodules in a measurement or control system. You can drive PXI_CLK10from an external source through the PXI_CLK10_IN pin on theP2 connector of the star trigger slot. Refer to Table B-4, P2 (J2) ConnectorPinout for the Star Trigger Slot. You must manually switch SW1 on thechassis backplane to enable or disable routing an external clock toperipheral slots.System Controller Slot [1]Star Trigger/Peripheral Slot [2]Peripheral Slot [3]Peripheral Slot [4]LocalBusLocalBusStar TriggersPCI Arbitration and Clock Signals