Table of Contents
7.7.14.4 SDI-12 Power Considerations........................................ 255
7.7.15 Compiling: Conditional Code................................................... 256
7.7.16 Measurement: RTD, PRT, PT100, PT1000 .............................. 258
7.7.16.1 Measurement Theory (PRT) .......................................... 259
7.7.16.2 General Procedure (PRT) ............................................... 260
7.7.16.3 Example: 100 Ω PRT in Four-Wire Half Bridge with
Voltage Excitation (PT100 / BrHalf4W() ) ................ 262
7.7.16.4 Example: 100 Ω PRT in Three-Wire Half Bridge with
Voltage Excitation (PT100 / BrHalf3W() ) ................ 266
7.7.16.5 Example: 100 Ω PRT in Four-Wire Full Bridge with
Voltage Excitation (PT100 / BrFull() ) ...................... 270
7.7.16.6 PRT Callendar-Van Dusen Coefficients ........................ 275
7.7.16.7 Self-Heating and Resolution .......................................... 279
7.7.17 Serial I/O: Capturing Serial Data ............................................. 279
7.7.17.1 Introduction.................................................................... 279
7.7.17.2 I/O Ports ......................................................................... 280
7.7.17.3 Protocols ........................................................................ 281
7.7.17.4 Glossary of Serial I/O Terms ......................................... 281
7.7.17.5 Serial I/O CRBasic Programming .................................. 284
7.7.17.5.1 Serial I/O Programming Basics ........................... 284
7.7.17.5.2 Serial I/O Input Programming Basics ................. 286
7.7.17.5.3 Serial I/O Output Programming Basics ............... 288
7.7.17.5.4 Serial I/O Translating Bytes ................................ 289
7.7.17.5.5 Serial I/O Memory Considerations ..................... 289
7.7.17.5.6 Serial I/O Example I ........................................... 290
7.7.17.6 Serial I/O Application Testing ....................................... 292
7.7.17.6.1 Configure HyperTerminal ................................... 292
7.7.17.6.2 Create Send-Text File ......................................... 294
7.7.17.6.3 Create Text-Capture File ..................................... 294
7.7.17.6.4 Serial I/O Example II .......................................... 295
7.7.17.7 Serial I/O Q & A ............................................................ 300
7.7.18 String Operations ...................................................................... 303
7.7.18.1 String Operators ............................................................. 303
7.7.18.2 String Concatenation...................................................... 304
7.7.18.3 String NULL Character ................................................. 306
7.7.18.4 Inserting String Characters ............................................ 307
7.7.19 Subroutines ............................................................................... 307
8. Operation ................................................................. 311
8.1 Measurements — Details................................................................. 311
8.1.1 Time Keeping — Details .......................................................... 311
8.1.1.1 Time Stamps .................................................................. 311
8.1.2 Analog Measurements — Details ............................................. 313
8.1.2.1 Voltage Measurement Quality ....................................... 314
8.1.2.2 Thermocouple Measurements — Details ....................... 331
8.1.2.3 Resistance Measurements — Details ............................. 332
8.1.2.3.1 Ac Excitation ...................................................... 335
8.1.2.3.2 Accuracy — Resistance Measurements .............. 335
8.1.2.4 Auto Self-Calibration — Details ................................... 337
8.1.2.4.1 Auto Self-Calibration Process ............................. 337
8.1.2.5 Strain Measurements — Details .................................... 343
8.1.2.6 Current Measurements — Details .................................. 344
8.1.2.7 Voltage Measurements — Details ................................. 345
8.1.2.7.1 Voltage Measurement Limitations ...................... 345
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