Integration and System Considerations
PXI Trigger Lines
Eight PXI bus trigger lines are highly flexible and can be used in a variety of ways. For example, triggers can be used to synchronize the operation of several different PXI peripheral devices. In other applications, one device can control carefully timed sequences of operations performed on other devices in the system. Triggers may be passed from one device to another, allowing precisely timed responses to asynchronous external events that are being monitored or controlled. The number of triggers that a particular application requires varies with the complexity and number of events involved.
The PXI Specification is implemented with the RTSI bus through the PXI trigger lines. PXI Specification requires eight lines, PXI_Trig<0..7>, on the P2/J2 connector of the PXI chassis for the trigger lines. The RTSI features of NI signal generators is implemented on this sub-bus. The RTSI triggers <0..6> are implemented on PXI_Trig<0..6>, and the RTSI clock is routed on PXI_Trig7.
For an overview of PXI-specific functions, refer to How do National Instruments PXI Boards map to the PXI Backplane?