National Instruments NI 784xR, NI 785xR - page 43

Chapter 2 Hardware Overview ofthe NI 78xxR

R Series Intelligent DAQ User Manual 2-22 ni.com

The PXI local bus right lines on the NI PXI-781xR/783xR are

PXI/LBR<0..12>. The PXI local bus left lines on the NI PXI-781xR/783xR

are PXI/LBLSTAR<0..12>.

The NIPXI-781 xR/783xR can configure each PXI local bus line either as

an input or an output signal. Only one device can drive the same physical

local bus line at a time. For example, if the NIPXI-781xR/783xR is

configured to drive a signal on PXI/LBR 0, the device in the slot

immediately to the right must have its PXI/LBLSTAR 0 line configured as

an input.

Caution Do not drive the same PXI local bus line with the NIPXI-781xR/783xR and

another device simultaneously. Such signal driving can damage both devices. NI is not

liable for any damage resulting from such signal driving.

The NIPXI-781 xR/783xR local bus lines are only compatible with 3.3V

signaling LVTTL and LVCMOS levels.

Caution Do not enable the local bus lines on an adjacent device if the device drives

anything other than 0–3.3V LVTTL signal levels on the NIPXI-781xR/783xR. Enabling

the lines in this way can damage the NIP XI-781xR/783xR. NI is not liable for any damage

resulting from enabling such lines.

The left local bus lines from the left peripheral slot of a PXI backplane

(Slot2) are routed to the star trigger lines of up to 13 other peripheral slots

in a two-segment PXI system. This configuration provides a dedicated,

delay-matched trigger signal between the first peripheral slot and the

other peripheral slots for precise trigger timing signals. For example—as

shown in Figure2-12—an NI PXI-781xR/783xR in Slot 2 can send an

independent trigger signal to each device plugged into Slots <3..15> using

the PXI/LBLSTAR<0..12>. Each device receives its trigger signal on its

own dedicated star trigger line.

Caution Do not configure the NI 781xR/783xR and another device to drive the same

physical star trigger line simultaneously. Such signal driving can damage the

NI78 1xR/783xR and the other device. NI is not liable for any damage resulting from

suchsignal driving.

Contents

Main Page Important Information Warranty Copyright Trademarks Patents Compliance Compliance with FCC/Canada Radio Frequency Interference Regulations Determining FCC Class FCC/DOC Warnings Class A Contents About This Manual Chapter 1 Introduction Chapter 2 Hardware Overview of the NI 78xxR Page About This Manual Conventions Related Documentation Reconfigurable I/O Documentation Page Additional Resources Introduction About the Reconfigurable I/O Device Using PXI with CompactPCI Overview of Reconfigurable I/O Reconfigurable I/O Concept Flexible Functionality User-Defined I/O Resources Device-Embedded Logic and Processing Reconfigurable I/O Architecture Reconfigurable I/O Applications Software Development LabVIEW FPGA Module LabVIEW Real-Time Module Cables and Accessories Custom Cabling Safety Information Page Page Hardware Overview of the NI 78xxR Figure 2-1. NI781xR Block Diagram Figure 2-2. NI7830R Block Diagram Chapter 2 Hardware Overview ofthe NI 78x xR National Instruments Corporation 2-3 R Series Intelligent DAQ User Manual Figure 2-3. NI7831R/7833R/784xR/785xR Block Diagram PCI/PXI/CompactPCI Bus NI 7811R Overview The NI 7811R has 160 bidirectional DIO lines and a Virtex-II XC2V1000 FPGA. NI 7813R Overview The NI 7813R has 160 bidirectional DIO lines and a Virtex-II XC2V3000 FPGA. NI 7830R Overview NI 7831R/7833R Overview NI 784xR Overview NI 785xR Overview Analog Input (Multifunction R Series Only) Input Modes Input Range Connecting Analog Input Signals Page Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Input Modes Figure 2-5 summarizes the recommended input mode for both types of signal sources. Figure 2-5. Summary of Analog Input Connections Differential Connection Considerations (DIFF Input Mode) Differential Connections for Ground-Referenced Signal Sources Differential Connections for Nonreferenced or Floating Signal Sources Single-Ended Connection Considerations Single-Ended Connections for Floating Signal Sources (RSE Input Mode) Single-Ended Connections for Grounded Signal Sources (NRSE Input Mode) Common-Mode Signal Rejection Considerations Analog Output Connecting Analog Output Signals Digital I/O Connecting Digital I/O Signals Page Page Page RTSI Trigger Bus PXI Local Bus (NI PXI-781xR/783xR Only) Page Chapter 2 Hardware Overview ofthe NI 78x xR National Instruments Corporation 2-23 R Series Intelligent DAQ User Manual Figure 2-12. PXI Star Trigger Connections in a PXI Chassis Switch Settings (NI 781xR/783xR Only) Note SW2 and SW3 are not connected. PXI Star* * A Slot 2 device ties the PXI Star Line to the PXI 10 MHz clock Slot 3 Page Page Page Page +5 V Power Source Device Fuse Replacement (NI 784xR/785xR Only) Page Field Wiring Considerations (NI 783xR/784xR/785xROnly) Calibration (NI 783xR/784xR/785xROnly) Loading Calibration Constants Internal Calibration External Calibration Page A Connecting I/O Signals Appendix A Connecting I/O Signals Figure A-1. NI 781xR Connector Pin Assignments and Locations R Series Intelligent DAQ User Manual A-2 ni.com Appendix A Connecting I/O Signals Figure A-2. NI 783xR/784xR/785xR Connector Pin Assignments and Locations National Instruments Corporation A-3 R Series Intelligent DAQ User Manual Table A-1. I/O Connector Signal Descriptions Caution Connections that exceed any of the maximum ratings of input or output signals Table A-2. NI78xx R I/O Signal Summary Connecting to 5B and SSR Analog Signal Conditioning (NI 783xR/784xR/785xR Only) Figure A-3 shows the connector pinouts when using the NSC68-262650 cable. Figure A-3. Connector Pinouts when Using NSC68-262650 Cable Connecting to SSR Digital Signal Conditioning AI 07 Connector DIO 015 Connector AO 07 Connector Figure A-4. Connector Pinouts when Using the NSC68-5050 Cable DIO 023 Connector DIO 2439 Connector B Using the SCB-68 Shielded Connector Block C Technical Support and Professional Services Page Glossary Numbers/Symbols A B C D Page I L M N O P R S T V W