7.9.14.2.1 Measurements from 101 to 600 Hz 2 ..................... 232
7.9.14.3 Measurement Rate: 601 to 2000 Hz ................................ 233
7.9.15 Measurement: PRT ................................................................... 234
7.9.15.1 Measuring PT100s (100 Ω PRTs) ................................... 235
7.9.15.1.1 Self-Heating and Resolution .................................. 235
7.9.15.1.2 PRT Calculation Standards .................................... 235
7.9.15.2 PT100 in Four-Wire Half-Bridge .................................... 238
7.9.15.2.1 Calculating the Excitation Voltage ........................ 239
7.9.15.2.2 Calculating the BrHalf4W() Multiplier ................. 239
7.9.15.2.3 Choosing Rf ........................................................... 240
7.9.15.3 PT100 in Three-Wire Half Bridge ................................... 241
7.9.15.4 PT100 in Four-Wire Full-Bridge ..................................... 242
7.9.16 PLC Control — Details............................................................. 244
7.9.17 Serial I/O: Capturing Serial Data .............................................. 245
7.9.17.1 Introduction ..................................................................... 245
7.9.17.2 I/O Ports .......................................................................... 246
7.9.17.3 Protocols .......................................................................... 247
7.9.17.4 Glossary of Serial I/O Terms .......................................... 247
7.9.17.5 Serial I/O CRBasic Programming ................................... 249
7.9.17.5.1 Serial I/O Programming Basics ............................. 250
7.9.17.5.2 Serial I/O Input Programming Basics .................... 251
7.9.17.5.3 Serial I/O Output Programming Basics ................. 252
7.9.17.5.4 Serial I/O Translating Bytes .................................. 253
7.9.17.5.5 Serial I/O Memory Considerations ........................ 253
7.9.17.5.6 Demonstration Program ......................................... 254
7.9.17.6 Serial I/O Application Testing ........................................ 256
7.9.17.6.1 Configure HyperTerminal ..................................... 256
7.9.17.6.2 Create Send-Text File ............................................ 258
7.9.17.6.3 Create Text-Capture File ....................................... 258
7.9.17.6.4 Serial I/O Example II ............................................. 259
7.9.17.7 Serial I/O Q & A ............................................................. 264
7.9.18 Serial I/O: SDI-12 Sensor Support — Programming
Resource ........................................................................................ 267
7.9.18.1 SDI-12 Transparent Mode ............................................... 267
7.9.18.1.1 SDI-12 Transparent Mode Commands .................. 268
7.9.18.2 SDI-12 Recorder Mode ................................................... 272
7.9.18.3 SDI-12 Sensor Mode ....................................................... 279
7.9.18.4 SDI-12 Power Considerations ......................................... 281
7.9.19 String Operations ...................................................................... 282
7.9.19.1 String Operators .............................................................. 282
7.9.19.2 String Concatenation ....................................................... 283
7.9.19.3 String NULL Character ................................................... 285
7.9.19.4 Inserting String Characters .............................................. 286
7.9.19.5 Extracting String Characters ........................................... 286
7.9.19.6 String Use of ASCII / ANSII Codes ............................... 287
7.9.19.7 Formatting Strings ........................................................... 287
7.9.19.8 Formatting String Hexadecimal Variables ...................... 288
7.9.20 Subroutines ............................................................................... 288
7.9.21 TCP/IP — Details ..................................................................... 289
7.9.21.1 PakBus Over TCP/IP and Callback ................................. 290
7.9.21.2 Default HTTP Web Server .............................................. 291
7.9.21.3 Custom HTTP Web Server ............................................. 291
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