National Instruments NI 783xR User Manual

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National Instruments NI 783xR User Manual Manual pdf 11 page image

Chapter 1 IntroductionNI 783xR User Manual 1-2 ni.comThe NI 783xR uses the Real-Time System Integration (RTSI) bus to easilysynchronize several measurement functions to a common trigger or timingevent. The NI PCI-783xR accesses the RTSI bus through a RTSI cableconnected between devices. The NI PXI-783xR accesses the RTSI busthrough the PXI trigger lines implemented on the PXI backplane.Refer to Appendix A, Specifications, for detailed NI 783xR specifications.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 still can use the basic plug-in cardfunctions. For example, the RTSI bus on the R Series device is available ina PXI 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 R Series device works in any standard CompactPCI chassisadhering to the PICMG CompactPCI 2.0 R3.0 core specification.PXI-specific features are implemented on the J2 connector of theCompactPCI bus. Table 1-1 lists the J2 pins used by the NI 783xR. TheNI 783xR is compatible with any CompactPCI chassis with a sub-bus thatdoes not drive these lines. Even if the sub-bus is capable of driving theselines, the R Series device is still compatible as long as those pins on thesub-bus are disabled by default and are never enabled.Caution Damage can result if the J2 lines are driven by the sub-bus.