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Chapter 3 LPM Devices
DAQ Hardware Overview Guide 3-2 www.ni.com
channel 0 is reached and the scan begins anew with the starting channel.
If the starting channel is channel 3, for example, the scan sequence is as
follows:
channel 3, channel 2, channel 1, channel 0, channel 3, and so on
You can use both the single-channel and multiple-channel acquisitions with
the double-buffered mode. Double-buffered mode fills the user-specified
buffer continuously. You can call the NI-DAQ function
DAQ_DB_Transfer or the LabVIEW AI_Read.vi or
AI_Buffer_Read.vi to transfer old data into a second buffer before
overwriting the old data with new data. NI-DAQ transfers data out of one
half of the buffer while filling the other half with new data.
LPM Device Data Acquisition Timing
Timing for data acquisition can be performed by the onboard MSM82C53
counter/timer or externally. The MSM82C53 Counter/Timer has three
independent 16-bit counters/timers, which are assigned as follows:
• Counter 0 is a sample-interval counter for data acquisition that is
available if no data acquisition is in progress.
• Counter 1 is available for general-purpose counting functions.
• Counter 2 is available for general-purpose counting functions.
Data acquisition timing involves the following timing signals:
•A conversion pulse is a signal that generates a pulse once every sample
interval, causing the device to initiate an A/D conversion. This signal
can be generated by the onboard, programmable sample-interval clock
supplied by the MSM82C53 Counter/Timer on the LPM device, or can
be supplied externally through the I/O connector EXTCONV* input.
You can select external conversion pulses by calling
DAQ_Config.
If you do not want to use external conversion pulses, you should
disconnect the EXTCONV* pin on the I/O connector to prevent extra
conversions.
•A timebase clock is a clock signal that is the timebase for the
sample-interval counter. Counter 0 of the MSM82C53 uses a 1 MHz
clock as its timebase.
See your device user manual for more information regarding these signals.
- 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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