Measurement-computing Data Acquisition Systems rev.10.4 Manual de usuario Pagina 27
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Programmer’s Manual 988594 API Programming, General Models 2-17
Assuming the voltage reference is connected to the internal default of 5 V, the next function will set
channel 0 to an output voltage of 5 V. The values are set for a digital-to-analog converter with 16 bit
resolution; 65535 represents full-scale. Channel 1 is equal to 0.
ret& = VBdaqDacSetOutputMode&(handle&, DddtLocal&, 0, DdomVoltage&)
ret& = VBdaqDacWt&(handle&, DddtLocal, 0, 65535)
The daqDacWtMany writes to both analog outputs simultaneously. The following lines sets channel 0 to 5
V and channel 1 to 2.5 V. At full-scale, a digital value of 65535 corresponds to 5 V; a digital value of
49152 corresponds to ½ of 5 V.
Dim deviceTypes&(1)
Dim chans&(1)
Dim dataVals%(1)
The VBdaqSetOutputMode puts the channel in a voltage mode.
ret& = VBdaqSetOutputMode&(handle&, DddtLocal&, 0, DdomVoltage&)
ret& = VBdaqSetOutputMode&(handle&, DddtLocal&, 1, DdomVoltage&)
deviceTypes&(0) = DddtLocal&
deviceTypes&(1) = DddtLocal&
chans&(0) = 0
chans&(1) = 1
dataVals&(0) = 65535
dataVals&(1) = 49152
ret& = VBdaqDacWtMany&(handle&, deviceTypes&(), chans&(), dataVals&(),2)
The following sets the outputs to 0 V.
Dim deviceTypes&(1)
Dim chans&(1)
Dim dataVals%(1)
deviceTypes&(0) = DddtLocal&
deviceTypes&(1) = DddtLocal&
chans&(0) = 0
chans&(1) = 1
dataVals&(0) = 32768
dataVals&(1) = 32768
ret& = VBdaqDacSetOutputMode&(handle&, DddtLocal&, 0, DdomVoltage&)
ret& = VBdaqDacSetOutputMode&(handle&, DddtLocal&, 1, DdomVoltage&)
ret& = VBdaqDacWtMany&(handle&, deviceTypes&(), chans&(), dataVals&(),2)
- *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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