National Instruments Module SCXI-1503 Instrukcja Użytkownika Strona 24
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Chapter 2 Connecting Signals
© National Instruments Corporation 2-11 SCXI-1503 User Manual
Rear Signal Connector Descriptions
The rear signal connector on the cabled module is the interface between
the DAQ device and all modules in the SCXI chassis. AI 0 is used to
differentially multiplex all 16 channels, the CJ sensor, and analog signals
from the modules to the connected DAQ device.
The communication signals between the DAQ device and the SCXI system
are listed in Table 2-4. If the DAQ device is connected to the SCXI-1503,
these digital lines are unavailable for general-purpose digital I/O.
Table 2-4. SCXI-1503 50-Pin Rear Connector Signals
Pin
SCXI
Signal Name
NI-DAQmx
Device Signal
Name
Direction Description
1, 2 AI GND AI GND — Analog input ground—connects to
the analog input ground of the DAQ
device.
3 AI 0 + AI 0 + Input Channel 0 positive—used to
differentially multiplex all
16 channels, the CJ sensor, and
analog signals from the modules to
the connected DAQ device.
4 AI 0 – AI 0 – Input Channel 0 negative—used to
differentially multiplex all
16 channels, the CJ sensor, and
analog signals from the modules to
the connected DAQ device.
24, 33 DIG GND D GND — Digital ground—these pins supply
the reference for E/M Series DAQ
device digital signals and are
connected to the module digital
ground.
25 SER DAT IN P0.0 Input Serial data in—this signal taps into
the SCXIbus MOSI line to send
serial input data to a module or
Slot 0.
- SCXI-1503 User Manual 1
- Important Information 3
- Conventions 4
- Contents 5
- Chapter 4 6
- Chapter 5 6
- About the SCXI-1503 9
- ❑ Software 10
- ❑ Documentation 10
- Chapter 1 About the SCXI-1503 11
- E/M Series DAQ Device 12
- Connecting Signals 14
- Chapter 2 Connecting Signals 15
- 4-Wire Configuration 16
- 2-Wire Configuration 17
- Two Matched Current Sources 19
- Front Connector 20
- Rear Signal Connector 23
- Configuring and Testing 26
- Configurable Settings in MAX 27
- NI-DAQmx 28
- Verifying the Signal 29
- Theory of Operation 31
- Chapter 4 Theory of Operation 32
- SCXIbus Interface 33
- Digital Control Circuitry 33
- Analog Circuitry 33
- RTD Measurement Errors 36
- Temperature in RTDs 36
- No standard. Check TCR 39
- Thermistors 40
- Using the SCXI-1503 44
- Chapter 5 Using the SCXI-1503 45
- Programmatically 46
- Completing the Application 51
- Text Based ADEs 54
- Calibration 56
- Specifications 58
- RTD Measurement Accuracy 59
- Amplifier Characteristics 59
- Dynamic Characteristics 60
- Stability 60
- Excitation 61
- Environmental 61
- Physical 62
- Maximum Working Voltage 62
- Electromagnetic Compatibility 63
- CE Compliance 63
- Removing the SCXI-1503 64
- Common Questions 66
- Appendix C Common Questions 67
- Glossary 69
- Numerics 76
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