Campbell CR800 Specifications Page 199
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Section 7. Measurement Instructions
SDMSpeed (BitPeriod)
Changes the rate that the CR800 uses to clock the SDM data. Slowing down
the clock rate may be necessary when long cables lengths are used to connect
the CR800 and SDM devices.
Parameter
& Data Type
Enter
BitPeriod
Constant or
variable
The time per bit, in microseconds.
Initial Setting (default): 26.04 µS
Resolution: 8.68 µS
Min Setting: 8.68 µS
Max Setting: 2.2 mS
SDMSpeed(30) gives: 26.04 µS
SDMSpeed(k) gives: bit_rate = INT((k*72)/625) * Resolution
When calculating SDMSpeed(k), the loggers round down to the next higher
bit.
SDMTrigger
When SDMTrigger is executed, the CR800 sends a "measure now" group
trigger to all connected SDM devices. SDM stands for Synchronous Device
for Measurement. SDM devices make measurements independently and send
the results back to the datalogger serially. The SDMTrigger instruction allows
the CR800 to synchronize when the measurements are made. Subsequent
Instructions communicate with the SDM devices to collect the measurement
results. Not all SDM devices support the group trigger; check the manual on
the device for more information.
SDMSW8A (Dest, Reps, SDMAddress, FunctOp, SW8AStartChan, Mult,
Offset)
The SW8A instruction is used to control the SDM-SW8A Eight-Channel
Switch Closure module, and store the results of its measurements to a variable
array.
Parameter
& Data Type
Enter
Dest
Variable or
Array
The variable in which to store the results of the SW8A measurement. The
variable array for this parameter must be dimensioned to the number of
Reps.
Reps
Constant
The number of channels that will be read on the SW8A. If (StartChan
+Reps –1) is greater than 8, measurement will continue on the next
sequential SW8A. In this instance, the addresses of the SDM devices must
be consecutive.
SDMAddress
Constant
The address of the first SW8A with which to communicate. Valid SDM
addresses are 0 through 15. If the SDMTrigger instruction is used in the
program, address 15 should not be used. If the Reps parameter used more
channels than are available on the first SW8A, the datalogger will increment
the SDM address for each subsequent device that it communicates with.
7-45
- CR800/CR850 Measurement 1
- Warranty and Assistance 2
- Appendix 7
- Figures 7
- OV1.1.8 Digital I/O (C1-4) 11
- OV1.1.9 Pulse Inputs (P1-2) 12
- OV1.1.10 Program Status 12
- OV1.2.1 CS I/O 12
- OV1.2.2 Computer RS-232 13
- OV2.1 Memory 14
- OV2.2 Programming 14
- OV2.3.1 Pipeline Mode 15
- OV2.3.2 Sequential Mode 15
- OV2.3.3 Slow Sequence Scans 16
- OV2.3.4 Task Priority 16
- OV2.4 Data Tables 17
- OV2.5 PakBus 17
- OV3. Device Configurator 18
- OV3.1 Main DevConfig Screen 19
- OV3.2 Deployment Tab 20
- OV3.2.2 Ports Settings 21
- OV3.2.3 Advanced 23
- OV3.3 Logger Control Tab 24
- OV3.5 Settings Editor Tab 26
- OV3.6 Terminal Tab 27
- OV4. Quick Start Tutorial 28
- OV4.4 PC200W Software 30
- OV4.4.4 Send the Program 35
- OV4.4.5 Monitor Data Tables 35
- OV4.4.6 Collect Data 36
- OV4.4.7 View Data 37
- OV5. Keyboard Display 39
- CR1000KD or CR850 Display 40
- OV5.1 Data Display 41
- CR800 and CR850 Overview 42
- 1.2 Power Requirements 53
- 12V ALKALINE BATTERY PACK 55
- 1.4 Solar Panels 58
- 1.7 CR800 Grounding 59
- 1.10 Maintenance 63
- 1.10.1 Desiccant 64
- 2.1 Data Storage in CR800 69
- 2.2 Internal Data Format 69
- 2.3 Data Collection 70
- 2.4 Data Format on Computer 70
- 3.1.1 Voltage Range 75
- 3.1.4 SettlingTime 77
- Measurements 78
- 3.3 Signal Settling Time 80
- Settling Time 82
- 3.4.1 Error Analysis 83
- Time Minutes 85
- Measured - Actual degrees C 85
- Thermocouple Limits of Error 86
- ± 0.5% Not Estab 86
- Noise on Voltage Measurement 88
- Error Summary 89
- can be minimized by making 90
- CR800 Junction Box 91
- 3.8 Self Calibration 95
- °C) the 96
- °C out into a 96
- Programming 97
- 4.2 Programming Sequence 98
- 4.3 Example Program 100
- CallTable Temp 102
- 4.4 Variable Data Types 103
- 4.5 Numerical Entries 105
- 4.6.1 What is True? 106
- 4.6.2 Expression Evaluation 106
- 4.7 Flags 107
- 4.8 Parameter Types 107
- AngleDegrees 111
- AS type 112
- PipelineMode 114
- SequentialMode 115
- Station Name 115
- Sub, Exit Sub, End Sub 116
- 6.1 Data Table Declaration 119
- 6.2 Trigger Modifiers 120
- OpenInterval 121
- FillStop 123
- DSP4 (FlagVar, Rate) 126
- BufferControl 127
- Remarks 128
- StatusCommand 129
- Highlimit, MinAmp, Form) 144
- Measured raw data: 150
- Calculations: 150
- ΘΘ ΘuNUSsNS 152
- ()(( /)) ( /) 153
- ΘuUS US=− =−21 811 153
- This is a blank page 154
- 7.8 Specific Sensors 156
- 7.9 Peripheral Devices 156
- 7.1 Voltage Measurements 157
- Integ, Mult, Offset) 158
- 7.4 Full Bridges 162
- 7.5 Excitation 164
- 7.6 Self Measurements 165
- Calibrate (Dest, AllRanges) 166
- 7.7 Digital I/O 169
- Timeout, Mult, Offset) 170
- ± 10 mV) and resolution (1.2 171
- Silicon diodes 171
- PortsConfig (Mask, Function) 172
- PortGet (Dest, Port) 172
- PortSet (Port, State) 173
- Constant 174
- ReadIO (Dest, Mask) 176
- Offset) 176
- WriteIO (Mask, Source) 177
- SlowAntenna 179
- Variable 180
- SettlingTime 181
- SDMAddress 184
- TimeQuanta t 185
- SDMSpeed (BitPeriod) 199
- SDMTrigger 199
- SDMX50 (SDMAddress, Channel) 200
- Mult, Offset) 201
- Instructions 203
- ACOS (Source) 204
- ASIN (Source) 206
- ATN (Source) 206
- AvgSpa (Dest, Swath, Source) 208
- Cos (Source) 209
- CosH (Source) 210
- FirstSetStart) 210
- DewPoint (Dest, Temp, RH) 211
- Exp (Numeric Expression) 213
- Frac (Source) 215
- Int, Fix 218
- Ln (Source) 219
- Log (Source) 219
- LOG10 (number) 219
- MaxSpa (Dest, Swath, Source) 220
- MinSpa (Dest, Swath, Source) 220
- Randomize (Number) 227
- RealTime 227
- RectPolar (Dest, Source) 228
- RMSSpa (Dest, Swath, Source) 229
- RND (Source) 229
- SatVP (Dest, Temp) 230
- Sgn (Number) 233
- Sin (Angle) 233
- SinH (Expression) 234
- Sqr (Number) 234
- Tan (Source) 235
- TANH (Source) 236
- Derived Math Functions 239
- Section 9. Program Control 241
- CallTable 242
- Data … Read … Restore 243
- ClockSet (Source) 244
- Delay (Option, Delay, Units) 244
- Do … Loop 245
- FileManage 246
- FileMark (TableName) 247
- For ... Next 247
- RunProgram 251
- ResetTable 252
- Scan … NextScan 252
- SelectCase … EndSelect 253
- Slow Sequence 257
- Timer (TimNo, Units, TimOpt) 259
- WaitDigTrig (Port, Edge) 260
- While…Wend 261
- DisplayMenu/EndMenu 264
- 11.1.1 Constant Strings 267
- 11.1.2 Add Strings 267
- Processing Instructions 268
- LowerCase (SourceString) 269
- StrComp (String1, String2) 270
- UpperCase (SourceString) 270
- Functions 271
- DialVoice (DialString) 272
- BooleanVariable) 273
- SerialClose (ComPort) 274
- SerialFlush (ComPort) 275
- ClockReport 280
- PakBusClock (PakBusAddr) 280
- Routes (Dest) 280
- GetSwath) 281
- TimeOut, Settings) 282
- TimeUntilTransmit 283
- 14.2.2 PakBus Address Setup 291
- 14.2.4 Router Setup 293
- 14.2.5.2 Baud Rates 294
- 14.3 PakBus Concepts 295
- 14.3.2 PakBus Devices 296
- 14.3.3 Neighbor Discovery 296
- 14.3.4 Neighbor Removal 297
- 14.3.6 Routers 298
- 14.3.8 Leaf-Nodes 302
- ComPort_2 303
- PakBusPort 303
- 14.4 Settings Editors 304
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