Using PXI-4461 PXI-4462 and PXI 4472 devices in PXI and PXIe chassis. Hardware: Modular Instruments>>Dynamic Signal Acquisition and Analysis (DSA)>>PXI-4461, Modular Instruments>>Dynamic Signal Acquisition and Analysis (DSA)>>PXI-4462
Problem: The NI 4461 and 4462 devices are offered in both standard PXI and PXI Express-ready (PXIe-ready) versions. What are the advantages/tradeoffs between versions and are there any caveats in compatibility? Solution: The PXIe-ready (hybrid-slot compatible) 446x devices have slightly less functionality only regarding synchronization schemes in comparision with a standard PXI 446x devices. The PXIe-ready 446x device had to make room for new connector pins used in hybrid PXI/PXI Express chassis. Standard PXI 446x devices can be synchronized with either of two methods: Clk10 or PXI Star Trigger. The Clk10 method uses the 10 MHz clock in the PXI backplane as the base clock. The PXI Star Trigger method requires one 446x to route its clock to the others as the base clock for synchronization. In either case, the synchronization results (drift, phase shift, etc.) are identical. With the PXIe-ready devices, some pins are removed from the connector, including the PXI Star Trigger pin. Thus the PXI Star Trigger method of synchronization is not possible in PXIe-ready 446x devices. One additional consideration is synchronization with a 447x devices (PXI-4472 and PXI-4472B). The 447x devices are only capable of synchronization with the PXI Star Trigger. Thus, if you want to synchronize 447x devices and 446x device, you will need to use the standard PXI 446x devices, which have the PXI Star Trigger pin. Also related is that 447x devices are not PXIe-ready (hybrid-slot compatible), so they cannot be used in hybrid PXI/PXI Express chassis. In general, NI recommends that customers continue to buy the standard PXI 446x devices unless you are also using PXI Express modules and/or a PXI/PXI Express hybrid chassis. Frequently Asked Questions Q: Can I use the PXI-446x that I currently have with new hybrid-slot compatible PXI-446x modules? Yes – By default, DAQmx Channel Expansion uses the Clk10 synchronization method when synchronizing multiple PXI-446x devices. This synchronization method is not affected with the hybrid compatible modules. The hybrid-compatible modules will look differently (they have different connectors) but they will operate identically. Q: Does the product bundle with the Sound and Vibration Toolkit include the hybrid-slot compatible module or the standard PXI module? The Sound and Vibration Toolkit bundles with the PXI-446x now include the hybrid-slot compatible module. The part number for these products has stayed the same but the bundle kit was changed to include the hybrid-slot compatible PXI-446x. Q: How do I synchronize PXI-447x and PXI-446x devices? PXI-447x and 446x devices can only be synchronized using the PXI Star Trigger method. This line is not available in the hybrid-slot compatible 446x modules, so you must use the standard PXI 446x devices with 447x devices. The 447x modules are not hybrid-slot compatible. Q: Can I use the PXI-447x in a PXIe Chassis? The PXI-447x can be used in the PXIe-1062 and PXIe-1065 chassis. They both have standard PXI slots that the boards can plug into. However, the star trigger lines on these chassis can only be driven by the PXI Express timing slot. This means you can not synchronize the PXI-447x modules installed in a PXIe chassis. Please use a standard PXI chassis to synchronize your PXI 447x modules. Q: Are the PCI-446x devices affected by this change? No – These devices continue to use RTSI connections for synchronization and therefore are unaffected. Additional details on PXIe-ready and hybrid-slot compatible changes The NI PXI-4461 and PXI-4462 are now available in both standard PXI and PXI hybrid slot-compatible form factors. The hybrid slot-compatible PXI-446x modules can be used in PXI slots, CompactPCI slots, and hybrid slots, found in hybrid PXI Express chassis. The PXI Systems Alliance specifies hybrid slot-compatible PXI modules to use modified slot connectors to mechanically fit in both PXI slots and hybrid slots. This mechanical change:
Hybrid slot-compatible PXI modules do not include the pins used for PXI Star Trigger synchronization. The PXI Star Trigger is only one method of synchronizing multiple PXI-446x devices. The Clk10 synchronization method for multiple PXI-446x devices is not affected and continues to be available for both standard PXI and hybrid slot-compatible form factors. In applications where synchronization using the Star Trigger is necessary, for example synchronizing 446x devices to 447x devices, please use the standard PXI form factor 446x modules. For more information about the removal of the PXI local bus connector please see the specification change linked below. Related Links: NI PXI-4461 Model Page NI PXI-4462 Model Page Notice of Specification Change - PXI Connector Attachments:
Report Date: 08/23/2006 Last Updated: 07/22/2007 Document ID: 40MCNTIP |
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
