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Chapter 2 Lab and 1200 Devices
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National Instruments Corporation 2-3 DAQ Hardware Overview Guide
depends on the length of the user-specified buffer and on the number of
samples specified to be acquired after receipt of the trigger.
Because there is only one EXTTRIG input on the device I/O connector,
a single acquisition cannot employ both of these trigger modes.
Double-buffered mode, like pretrigger mode, also fills the user-specified
buffer continuously. Unlike pretrigger mode, however, double-buffered
mode transfers old data into a second buffer before overwriting the old data
with new data. Data is transferred out of one half of the buffer while the
other half is being filled with new data. You can use double-buffered mode
in conjunction with either pretrigger or posttrigger modes.
You can use SCXI modules as a data acquisition front end for all Lab and
1200 devices except the DAQPad-1200 to signal condition the input signals
and multiplex the channels. You can use all the modes just described in
conjunction with SCXI for single-channel acquisitions; however, onboard
multiple-channel acquisitions are only supported when using the
SCXI-1120, SCXI-1120D, or SCXI-1121 modules in parallel mode.
Chapter 14, SCXI Hardware, describes how the SCXI functions are used to
set up the SCXI modules for a data acquisition to be performed by a DAQ
device.
Note Refer to the Set_DAQ_Device_Info function in the NI-DAQ Function Reference
Online Help or the
Set_DAQ_Device_Info.vi in the LabVIEW DAQ Online Reference
for information on data transfer modes.
Lab and 1200 Devices Data Acquisition Timing
Timing for data acquisition can be performed by the two onboard
8253 Counters/Timers or externally. Each 8253 Counter/Timer has three
independent 16-bit counters/timers.
• Counter A0 is a sample-interval counter reserved for data acquisition.
• Counter A1 is a sample counter reserved for data acquisition.
• Counter A2 is an update-interval counter reserved for waveform
generation.
• Counter B0 is used for extending the timebase for data acquisition or
waveform generation when the interval between samples or updates is
greater than 65,535.
• Counter B1 is available for general-purpose counting functions.
However, it is reserved during data acquisition interval scanning.
• Counter B2 is available for general-purpose counting functions.
- DAQ Hardware Overview 1
- Important Information 3
- Chapter 14 7
- SCXI Hardware 7
- Glossary 10
- Contents 11
- About This Guide 12
- MIO and AI Device Terminology 15
- Table 1 16
- Related Documentation 17
- MIO and AI Devices 18
- Chapter 1 MIO and AI Devices 19
- E Series Data Acquisition 20
- Set_DAQ_Device_Info 22
- MIO Device Analog Output 24
- E Series Digital I/O 26
- E Series PFI Pins 27
- Lab and 1200 Devices 28
- AI_Trigger_Config.vi 31
- DAQ_StopTrigger_Config 31
- Table 2-2 32
- Lab and 1200 Devices Groups 33
- Figure 2-1 34
- 1200 Device Acquisition Rate 35
- 1200 Device Calibration 36
- LPM Devices 37
- DAQ_Config 38
- LPM Device Digital I/O 39
- LPM Device Counter/Timers 40
- 516 Devices and 41
- DAQCard-500/700 Devices 41
- DAQ_Config. If you do 43
- Counter/Timer Operation 44
- Figure 4-2 45
- AT-AO-6/10 Analog 46
- Output Devices 46
- AT-AO-6/10 Digital I/O 48
- 6703/6704 Devices 49
- PC-TIO-10 Timing I/O Device 50
- PC-TIO-10 Counter/Timers 54
- PC-TIO-10 Digital I/O 55
- DIO-96 Digital I/O Devices 56
- DIO-96 Groups 57
- DIO-24 (6503) 58
- AT-MIO-16DE-10, and 6025E 58
- DIO-32F and 6533 60
- Digital I/O Devices 60
- Digital_Buffer_Write.vi) 62
- AMUX-64T External 63
- Multiplexer Accessory 63
- Table 11-2 64
- AMUX-64T Channel Numbers 64
- SCAN_Setup or 65
- MIO_Config 67
- Accessories 68
- SC-2042-RTD Accessory 69
- SC-2043-SG Accessory 69
- SCC Series Modules 70
- SCC-CI20 Current Input Module 72
- SCC-LP Lowpass Filter Modules 73
- SCC Configuration 74
- SCXI Operating Modes 76
- Chapter 14 SCXI Hardware 77
- SCXI Data Acquisition Device 80
- SCXI-1200 80
- SCXI Analog Input Modules 81
- SCXI-1100 81
- SCXI-1101 82
- SCXI-1104/C 83
- SCXI-1112 83
- SCXI_Scale function to 84
- SCXI_Single_Chan_Setup 84
- SCXI-1125 85
- SCXI-1122 85
- SCXI-1126 86
- SCXI-1127 87
- SCXI-1140 87
- SCXI Analog Output Module 89
- SCXI-1124 89
- SCXI Digital Modules 90
- SCXI-1160 and SCXI-1161 90
- SCXI-1162 and SCXI-1162HV 91
- SCXI-1163 and SCXI-1163R 91
- SCXI-1530, SCXI-1531 92
- SCXI-1540 92
- SCXI_Track_Hold_Setup 94
- DIO-24 and the DIO-96 96
- DIO-32F and 6533 Device 97
- VXI-DAQ Devices 99
- AO_Change_Parameter or the 100
- Multifunction VXIbus Devices 101
- VXI-DAQ Signal Conditioning 102
- VXI-SC-1102 Submodule 103
- VXI-SC-1150 Submodule 103
- PXI DAQ Devices 104
- PXI DAQ Signal Conditioning 105
- NI 5411 Devices 106
- Chapter 17 NI 5411 Devices 107
- DDS Mode 108
- Table 17-2 110
- NI 5411 Operational Modes 110
- Device Analog Input 112
- Data Acquisition 113
- Acquisition Timing 114
- Current Source 115
- Digital I/O 115
- Device Input 116
- Chapter 19 NI 40XX Devices 118
- DSA Devices 119
- and NI 455 120
- Analog Input Channels 120
- Data Acquisition Timing 121
- Channels 122
- Digital I/O 123
- Counter/Timer Operation 124
- Devices 125
- Chapter 21 671X Devices 126
- Technical Support Resources 129
- Worldwide Support 130
- Numbers/Symbols 131
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