CR200/CR200X Series Dataloggers - Campbell Scientific

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Section 4. Sensor Support 4.6 SDI-12 Recording Read More! SDI-12 Sensor Support p. 112 and Serial Input / Output p. 105. SDI-12 is a communications protocol developed to transmit digital data from smart sensors to data acquisition units. It is a simple protocol, requiring only a single communication wire. Typically, the data acquisition unit also supplies power (12V and ground) to the SDI-12 sensor. The CR200(X) is equipped with 1 SDI-12 channel and an SDI12Recorder () CRBASIC instruction. 4.7 Cabling Effects on Measurements Sensor cabling can have significant effects on sensor response and accuracy. This is usually only a concern with sensors acquired from manufacturers other than Campbell Scientific. Campbell Scientific sensors are engineered for optimal performance with factory installed cables. 4.7.1 Analog Sensor Cables Cable length in analog sensors is most likely to affect the signal settling time. For more information, see Signal Settling Time. 4.7.2 Pulse Sensors Because of the long interval between switch closures in tipping bucket rain gages, appreciable capacitance can build up between wires in long cables. A built up charge can cause arcing when the switch closes, shortening switch life. As shown in FIGURE. Current Limiting Resistor in a Rain Gage Circuit (p. 46), a 100 ohm resistor is connected in series at the switch to prevents arcing. This resistor is installed on all rain gages currently sold by Campbell Scientific. Figure 32: Current Limiting Resistor in a Tipping Bucket Rain Gage Circuit 46
Section 4. Sensor Support 4.7.3 Serial Sensors 4.7.3.1 SDI-12 Sensors The SDI-12 standard allows cable lengths of up to 200 feet. Campbell Scientific does not recommend SDI-12 sensor lead lengths greater than 200 feet; however, longer lead lengths can sometimes be accommodated by increasing the wire gage and/or powering the sensor with a second 12 vdc power supply placed near the sensor. 47
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OPERATOR’S MANUAL CR200/CR200X Se
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Assistance Products may not be retu
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Table of Contents 4.4 Pulse Count M
Page 8 and 9: Table of Contents 11.4.3 SDI-12 Pow
Page 10 and 11: Table of Contents Index ...........
Page 12 and 13: Table of Contents CRBASIC EXAMPLE 1
Page 14 and 15: Section 1. Introduction Table 1. CR
Page 16 and 17: Section 2. Quickstart Tutorial 2.1.
Page 20 and 21: Section 2. Quickstart Tutorial Figu
Page 24 and 25: Section 2. Quickstart Tutorial Exam
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Page 36 and 37: Section 3. Overview Figure 25: Feat
Page 38 and 39: Section 3. Overview Period Average:
Page 40 and 41: Section 3. Overview 3.1.3.4 Power T
Page 42 and 43: Section 3. Overview 3.1.5.1 Firmwar
Page 44 and 45: Section 3. Overview Advantages of P
Page 46 and 47: Section 3. Overview Table 3. Intern
Page 48 and 49: Section 3. Overview 36
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Page 62 and 63: Section 5. Measurement and Control
Page 64 and 65: Section 5. Measurement and Control
Page 66 and 67: Section 6. CR200(X) Power Supply Au
Page 68 and 69: Section 7. Grounding 7.1.1 Lightnin
Page 70 and 71: Section 7. Grounding Examples: •
Page 72 and 73: Section 8. CR200(X) Configuration F
Page 74 and 75: Section 8. CR200(X) Configuration T
Page 76 and 77: Section 8. CR200(X) Configuration 8
Page 78 and 79: Section 8. CR200(X) Configuration
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Page 84 and 85: Section 9. Programming 9.5 Structur
Page 86 and 87: Section 9. Programming Variable nam
Page 88 and 89: Section 9. Programming CRBASIC EXAM
Page 90 and 91: Section 9. Programming DataTable ()
Page 94 and 95: Section 9. Programming Consider the
Page 96 and 97: Section 9. Programming Scan () dete
Page 98 and 99: Section 9. Programming 9.9.4 Expres
Page 102 and 103: Section 9. Programming 9.11 Program
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Page 106 and 107: Section 10. CRBASIC Programming Ins
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Section 10. CRBASIC Programming Ins
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Section 11. Programming Resource Li
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Section 12. Memory and Data Storage
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Section 13. Telecommunications and
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Section 14. PakBus Overview • Rou
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Section 14. PakBus Overview 14.4.6
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Section 14. PakBus Overview 14.5.3
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Section 15. Alternate Telecoms Reso
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Section 15. Alternate Telecoms Reso
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Section 16. Support Software 16.4 P
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Section 16. Support Software 146
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Section 17. Care and Maintenance Fi
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Section 17. Care and Maintenance 15
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Section 18. Troubleshooting 18.1.1.
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Section 18. Troubleshooting Table 2
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Section 18. Troubleshooting 18.3.3
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Section 18. Troubleshooting 18.3.3.
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Section 18. Troubleshooting 160
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Appendix A. Glossary baud rate sett
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Appendix A. Glossary Earth Ground u
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Appendix A. Glossary modem/terminal
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Appendix A. Glossary period average
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Appendix A. Glossary the table is e
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Appendix A. Glossary VAC Volts Alte
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Appendix A. Glossary 14
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Appendix B. Status Table and Settin
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Appendix C. Serial Port Pin Outs 22
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Appendix D. ASCII / ANSI Table Dec
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Appendix D. ASCII / ANSI Table Dec
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Appendix F. Sensors and Peripherals
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Index Debugging • 151 Declaration
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Index O Offset • 86 Ohm • 6 Ohm
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Index U UPS • 11 User Program •
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CR200/CR200X Series Dataloggers - Campbell Scientific

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