Measurement-computing Data Acquisition Systems rev.10.4 Manual de usuario Pagina 32
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2-22 API Programming, General Models 988594 Programmer’s Manual
Now configure the Daq device with this information, and read 5 scans of data:
Dim chans&(4), gains&(4), buf%(20)
handle& = VBdaqOpen&(“DaqBook0”)
' Set array of channels and gains
chans&(0) = 0
gains&(0) = DgainX1&
chans&(1) = 1
gains&(1) = DgainX2&
chans&(2) = 2
gains&(2) = DgainX2&
chans&(3) = 3
gains&(3) = DgainX2&
' Load scan sequence FIFO :
ret& = VBdaqAdcSetScan&(handle&, chans&(), gains&(), 4)
' Set Clock
ret& = VBdaqAdcFreq&(handle&, 10)
' Define and arm trigger :
ret& = VBdaqAdcSetTrig&(handle&, DtsSoftware&, 0, 0, 0, 0)
' Trigger
ret& = VBdaqAdcSoftTrig&(handle&)
' Read the data
‘ 5 indicates the number of scans
‘ single mode for scans less than 500
ret& = VBdaqAdcTransferSetBuffer&(handle&, buf%(), 5, DatmCycleOff& +
DatmSingleMode&)
ret& = VBdaqAdcTransferStart&(handle&)
‘specifies to wait for the transfer to be complete
ret& = VBdaqWaitForEvent&(handle&, DteAdcDone&)
ret& = VBdaqAdcTransferGetStat&(handle&, active&, retCount&)
' Print the first scan of unconverted data
PRINT "Before Calibration:"
PRINT "Channel 0 at x1 gain: "; buf%(0)
PRINT "Channel 1 at x2 gain: "; buf%(1)
PRINT "Channel 2 at x2 gain: "; buf%(2)
PRINT "Channel 3 at x2 gain: "; buf%(3)
'Perform zero compensation on readings sampled at x1 gain
ret& = VBdaqCalSetupConvert&(handle&, 4, 0, 1, 0, DgainX1&, 0, 1, 0, buf%(),
5)
'Perform zero compensation on readings sampled at x2 gain
ret& = VBdaqCalSetupConvert&(handle&, 4, 1, 3, 0, DgainX2&, 1, 1, 0, buf%(),
5)
' Print the first scan of converted data
PRINT "After Calibration:"
PRINT "Channel 0 at x1 gain: "; buf%(0)
PRINT "Channel 1 at x2 gain: "; buf%(1)
PRINT "Channel 2 at x2 gain: "; buf%(2)
PRINT "Channel 3 at x2 gain: "; buf%(3)
- *372195A-01* 1
- How to use this Manual 3
- 908494 Programmer’s Manual 4
- Table of Contents 5
- Introduction 1 7
- Language Support 8
- Driver Installation 9
- 908494 Programmer’s Manual 10
- Data Acquisition Environment 11
- Signal Environment 12
- 988594 Programmer’s Manual 14
- For x% = 0 To 3 30
- 0, 0, x%, bitVal&) 30
- Next x% 30
- Zero Compensation 33
- Linear Conversion 35
- End Sub 36
- Using Multiple Devices 3 37
- Internal Clock Method 40
- Master Clock Method 41
- External Clock Method 43
- Overview 45
- 938395 Programmer’s Manual 46
- Mask and Flag Definitions 50
- 961 962 963 ... 999 59
- 941 942 ... 958 959 960 59
- Raw Data Formats 81
- Setting the Scan Rate 89
- Scan Rate Mode 89
- Scan Rate State 90
- Actual Scan Rate 90
- 94
- DBK16-Read Offset Trimpot 95
- DBK43-Read Offset Trimpot 96
- Typical flags Settings 100
- Settings 101
- Prototypes 102
- Program References 102
- Function Usage 104
- Visual BASIC 105
- Returns 114
- Data Transfer Progress 115
- Example Acquisition States 116
- DazcNone 124
- DazcAutoZero 124
- Parameter Type Description 129
- Definition Description 129
- Purpose 131
- Offset value to apply 142
- Parameter Values 144
- parameters 148
- Parameter Summary 150
- Parameter Type Definitions 150
- Moving Averages 160
- Definition Description 165
- Using Thermocouples (T/Cs) 172
- T/C Gains Settings 173
- Daq/2000 Series devices* 174
- Setting the Output Mode 184
- Buffer Management 201
- DAC0 DAC1 DAC2 DAC3 P3 DO 202
- DAC0 DAC2 P3 DO 202
- Note 1: 206
- Offset for header in bytes 208
- Update Cycle Data Blocks 211
- Update/Sample Data Format 212
- Output From File Operation 212
- DaqBoard/2000c Series 219
- Setting the DAC Value 227
- 908794 Programmer’s Manual 232
- (continued) 249
- DdiProtocolInfo 251
- DdiExtFeatures 251
- Local I/O 262
- Expansion I/O 262
- Local I/O 266
- 957193 Programmer’s Manual 280
- (for 14 sample settings 282
- 2, 4, 8, 16, 32, 64 282
- 128, etc. up to 16384) 282
- Option Value (optionValue) 284
- Counter Mode 285
- 908594 Programmer’s Manual 286
- Set the Excitation Source 289
- DmotWbk14ExcSrcApply 289
- Sets the Dac Offset 290
- Use DC coupling when 290
- Example: 291
- DcovWbk17Mode_Period 295
- DcovWbk17Mode_Pulsewidth 296
- DcovWbk17Mode_Timing 296
- DcovWbk17Mode_Encoder 296
- Setting the Trigger Level 306
- API Error Codes - daqError 319
- A2 - 162 331
- Programmer’s Manual 332
- Appendix A A 333
- 988294 Programmer’s Manual 334
- 939198 Programmer’s Manual 336
- Custom OEM Installation C 337
- WIN 9x/Me WIN NT/2000/XP 338
- WIN 9x/Me and 338
- WIN NT/2000/XP 338
- Installation Locations: 339
- 958293 Programmer’s Manual 340
- 938295 Programmer’s Manual 342
- Format 347
- Time-of-Day Configuration 356
- Glossary 359
- 986896 Programmer’s Manual 360
- 986896 Glossary G-3 361
- 986896 Glossary G-5 363
- 986896 Glossary G-7 365
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