National Instruments NI 783xR Input Modes

Chapter 2 Hardware Overview ofthe NI 783xR

© National Instruments Corporation 2-3 NI 783xR User Manual

±10V. The converters return data in two’s complement format. Table 2-1

shows the ideal output code returned for a given AI voltage.

Input Modes

The NI78 3xR input mode is software configurable. The input channels

support three input modes—differential (DIFF), referenced single ended

(RSE), and nonreferenced single ended (NRSE). The selected input mode

applies to all the input channels. Table 2-2 describes the three input modes.

Table 2-1. Ideal Output Code and AI Voltage Mapping

Input Description AI Voltage

Output Code (Hex)

(Two’sComplement)

Full-scale range –1LSB 9.999695 7FFF

Full-scale range –2LSB 9.999390 7FFE

Midscale 0.000000 0000

Negative full-scale range +1LSB –9.999695 8001

Negative full-scale range –10.000000 8000

Any input voltage —

Table 2-2. Available Input Modes for the NI783xR

Input Mode Description

DIFF When the NI783 xR is configured in DIFF input mode, each channel uses two

AIli nes. The positive input pin connects to the positive terminal of the onboard

instrumentation amplifier. The negative input pin connects to the negative input

of the instrumentation amplifier.

RSE When the NI 783xR is configured in RSE input mode, each channel uses only its

positive AI pin. This pin connects to the positive terminal of the onboard

instrumentation amplifier. The negative input of the instrumentation amplifier

connects internally to the AI ground (AIGND).

NRSE When the NI783 xR is configured in NRSE input mode, each channel uses only

its positive AI pin. This pin connects to the positive terminal of the onboard

instrumentation amplifier. The negative input of the instrumentation amplifier on

each AI channel connects internally to the AISENSE input pin.

Output Code

32,768

----------------------------------10.0 V×

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 783xR Page About This Manual Conventions Reconfigurable I/O Documentation Related Documentation Introduction About the NI 783xR 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 Optional Equipment Custom Cabling Safety Information Page National Instruments Corporation 2-1 NI 783xR User Manual Hardware Overview of the NI 783xR RTSI/PXI Triggers Connector 0 (MIO) PCI/PXI/CompactPCI Bus Figure 2-1. NI7830R Block Diagram NI 7830R Overview NI 7831R/7833R Overview Analog Input User- Configurable FPGA on RIO Devices Connector 0 (MIO) Input Modes Input Range Connecting Analog Input Signals Page Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Input Modes Figure 2-4. 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 Page 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 RTSI Trigger Bus PXI Local Bus (for NI PXI-783xR only) Switch Settings Page Page Power Connections Field Wiring Considerations Calibration Loading Calibration Constants Internal Calibration External Calibration A Specifications Analog Input Input Characteristics Accuracy Information DC Transfer Characteristics Dynamic Characteristics Settling Time Analog Output Output Characteristics Accuracy Information DC Transfer Characteristics Voltage Output Dynamic Characteristics Digital I/O Reconfigurable FPGA Calibration Bus Interface Power Requirement Physical Maximum Working Voltage Environmental Operating Environment Storage Environment Shock and Vibration (for NI PXI-783xR Only) Safety Electromagnetic Compatibility CE Compliance B Connecting I/O Signals Appendix B Connecting I/O Signals NI 783xR User Manual B-2 ni.com Figure B-2. NI783xR I/O Connector Pin Assignments NI7 83xR DIO NI 7830R MIO NI 7831R/7833R MIO Caution Connections that exceed any of the maximum ratings of input or output signals Table B-1. I/O Connector Signal Descriptions Connecting to CompactRIO Extension I/O Chassis Table B-2. NI783xR I/O Signal Summary Connecting to 5B and SSR Signal Conditioning Figure B-3. Connector Pinouts when Using NSC68-262650 Cable AO 07 Connector AI 07 Connector DIO 015 Connector Figure B-4. Connector Pinouts when Using the NSC68-5050 Cable DIO 023 Connector DIO 2439 Connector C Using the SCB-68 Shielded Connector Block D 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