National Instruments NI PXI-7831R User Manual

Also see for NI PXI-7831R: User manual User manual Note to Users User manual User manual

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National Instruments NI PXI-7831R User Manual Manual pdf 10 page image

Chapter 1 IntroductionNI PXI-7831R User Manual 1-2 ni.comThe PXI chassis has the Real-Time System Integration (RTSI) bus to easilysynchronize several measurement functions to a common trigger or timingevent. The RTSI bus is implemented on the PXI trigger bus on the PXIbackplane. The RTSI bus can route timing and trigger signals between asmany as seven PXI devices in your system.Refer to Appendix A, Specifications, for detailed specifications of the RIOdevice.Using PXI with CompactPCIUsing PXI compatible products with standard CompactPCI products is animportant feature provided by PXI Hardware Specification Revision 2.1and PXI Software Specification Revision 2.1. If you use a PXI-compatibleplug-in card in a standard CompactPCI chassis, you cannot usePXI-specific functions, but you can still use the basic plug-in cardfunctions. For example, the RTSI bus on the RIO device is available in aPXI chassis, but not in a CompactPCI chassis.The CompactPCI specification permits vendors to develop sub-buses thatcoexist with the basic PCI interface on the CompactPCI bus. Compatibleoperation is not guaranteed between CompactPCI devices with differentsub-buses nor between CompactPCI devices with sub-buses and PXI.The standard implementation for CompactPCI does not include thesesub-buses. The RIO device works in any standard CompactPCI chassisadhering to PICMG CompactPCI 2.0 R3.0.PXI-specific features are implemented on the J2 connector of theCompactPCI bus. Table 1-1 lists the J2 pins used by the NI PXI-7831R.The NI PXI-7831R is compatible with any CompactPCI chassis with asub-bus that does not drive these lines. Even if the sub-bus is capable ofdriving these lines, the RIO device is still compatible as long as those pinson the sub-bus are disabled by default and are never enabled.Caution Damage can result if the J2 lines are driven by the sub-bus.