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Appendix E. HC2S3 Digital Communications

E-5

E.4 RS-485 Communications using an SDM-SIO1

Serial I/O Module

The HC2S3 can be interfaced to a Campbell Scientific datalogger through an

SDM-SIO1 Serial I/O Module using the Rotronic E2-05XX-MOD RS485

cable as described below.

The example program uses the SerialOpen instruction to configure the SDM-

SIO1 for RS-485 half duplex, “COMport 32” at 19200 baud, no parity, 1 stop

bit, and 8 data bits, and serial instructions to send the RDD command to get

temperature and relative humidity data from the probe.

Sensor Wiring:

E2-05XX-MOD Cable SDM-SIO1 CR1000

Blue

Red

Gray/Yellow

Green

12V

Clear

Ground

SDM-SIO1 Wiring:

SDM-SIO1

CR1000

12V

If the Rotronic cable includes brown and white wires (voltage

signals for temperature and humidity), Campbell Scientific

recommends “capping” them with pn 27749 or equivalent

insulated caps to prevent the possibility of shorting.

NOTE

Содержание HC2S3

Страница 2: ......

Страница 3: ...ucts to CSI CSI will return such Products by surface carrier prepaid within the continental United States of America To all other locations CSI will return such Products best way CIP port of entry per...

Страница 4: ...ing address is CAMPBELL SCIENTIFIC INC RMA _____ 815 West 1800 North Logan Utah 84321 1784 For all returns the customer must fill out a Statement of Product Cleanliness and Decontamination form and co...

Страница 5: ...beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit cl...

Страница 6: ......

Страница 7: ...allation 7 7 1 Wiring to Datalogger 7 7 2 Datalogger Programming 9 7 2 1 VoltSE Instruction 9 7 2 2 VoltDiff Instruction 10 7 3 Installation 10 7 3 1 Installation in a 41003 5 10 Plate Shield 11 7 3 2...

Страница 8: ...ing an MD485 RS 485 Interface E 3 E 4 RS 485 Communications using an SDM SIO1 Serial I O Module E 5 Figures 7 1 HC2S3 and 41003 5 Radiation Shield on a CM200 Series Crossarm left and on a tripod mast...

Страница 9: ...cted consult a Campbell Scientific application engineer Although rugged the HC2S3 should be handled as a precision scientific instrument Do not touch the sensor element Santoprene rubber which compose...

Страница 10: ...he cable 3 1 Ships With The HC2S3 ships with 1 27731 Gill Radiation Shield Hex Plug 1 Calibration Card 4 QuickStart Short Cut is an easy way to program your datalogger to measure the HC2S3 sensor and...

Страница 11: ...vices list select the Sensors Meteorological Relative Humidity Temperature HC2S3 Temperature and Relative Humidity Sensor folder Choose either constant power or panel switched power uses less current...

Страница 12: ...software data display to make sure it is making reasonable measurements 5 Overview The HC2S3 is a digital probe with linear voltage outputs for temperature and humidity and a UART serial interface It...

Страница 13: ...ttended applications Accurate and rugged Compatible with the following CRBasic dataloggers CR200 X series CR6 CR800 series CR1000 CR3000 CR9000 X Operating Limits 40 to 100 C Storage Temperature 50 to...

Страница 14: ...year Sensor Time Constant 63 step change 1 m s air flow at sensor Standard PE Filter 22 s Optional Teflon Filter 30 s Accuracy over Measurement Range 6 2 Relative Humidity Measurement Sensor ROTRONIC...

Страница 15: ...s this work for you See Section 4 QuickStart p 2 for a Short Cut tutorial 7 1 Wiring to Datalogger Connections to Campbell Scientific dataloggers for measuring humidity and temperature using two singl...

Страница 16: ...logger Doing otherwise will connect the datalogger s analog and power ground planes to each other which in some cases can cause offsets on low level analog measurements To avoid 2 mA flowing into anal...

Страница 17: ...following sections Complete program examples for select dataloggers can be found in Appendix B Example Programs p B 1 7 2 1 VoltSE Instruction When cable lengths are shorter than 6 1 meters or when p...

Страница 18: ...rotect the filter at the top of the sensor from exposure to liquid water The hydrophobic nature of the filter repels light rain but driving rain can force itself into the pore structure of the filter...

Страница 19: ...m 1 in of the sensor exposed below the collar See FIGURE 7 1 3 Hold the collar and sensor and finish threading the collar into the shield by hand Tighten the collar around the probe until it firmly gr...

Страница 20: ...GURE 7 2 HC2S3 and RAD10 Radiation Shield on a tripod mast 8 Operation 8 1 Measurement The probe uses a Rotronic IN1 capacitive sensor to measure RH and a 100 PRT to measure temperature Campbell Scien...

Страница 21: ...The HC2S3 draws approximately 2 mA when powered with 12 V The wire used in the HC2S3 pn 27746 has resistance of 14 74 304 8 m 1000 ft Because the signal reference and the power ground are both connect...

Страница 22: ...ture is shown in the graph in Section 6 Specifications p 5 For example at 20 C the accuracy is 2 3 so a reading of 102 3 at 100 humidity is within the accuracy specification Programs created by Short...

Страница 23: ...matologist 1985 Publication of the American Association of State Climatologists Heights and Exposure Standards for Sensors on Automated Weather Stations v 9 No 4 October 1985 www stateclimate org publ...

Страница 24: ......

Страница 25: ...e in Section 4 QuickStart p 2 Finish the program On the Advanced tab click the CRBasic Editor button The program opens in CRBasic with the name noname CR_ Provide a name and save the program Once the...

Страница 26: ......

Страница 27: ...0 Color Function Terminal Brown Temperature signal SE2 White Relative Humidity signal SE1 Yellow Signal Reference Ground Symbol Gray Power Ground Ground Symbol Clear Shield Ground Symbol Green Power 1...

Страница 28: ...ive humidity every 60 minutes Wiring Diagram HC2S3 Wire CR1000 Color Function Terminal Brown Temperature signal 1H Jumper to Yellow Temperature signal reference 1L White Relative Humidity signal 2H Ye...

Страница 29: ...the relative humidity without causing a change absolute humidity For example for an air temperature of 20 C and a vapor pressure of 1 17 kPa the saturation vapor pressure is 2 34 kPa and the relative...

Страница 30: ...must be a fraction e_kPa e_Sat RH_Frac CallTable Temp_RH NextScan EndProg C 1 Measurement Below 0 C The HC2S3 provides a humidity reading that is referenced to the saturated water vapor pressure abov...

Страница 31: ...put 2 parameter scale and unit Temperature 40 60 deg C Communications Protocol RO ASCII RS 485 Address 0 Device name Probe type Humidity temperature adjustment Device write protection Disabled Limit h...

Страница 32: ...B driver must be installed on the PC Both the driver and the installation instructions document E M HW4v3 Main are located on the HW4 CD D 3 Changing the Temperature Range Install the HW4 software and...

Страница 33: ...he temperature range If the range has been changed from the default 40 to 60 then the multiplier and offset for the measurement instruction will have to be changed from those shown for the program exa...

Страница 34: ...Appendix D Changing the HC2S3 Settings D 4 Example measurement instructions for CR1000 datalogger with the sensor wired to SE channel 2 Public AirTC VoltSe AirTC 1 mV2500 2 0 0 _60Hz 0 09 60...

Страница 35: ...1 Serial I O Module p E 5 respectively HC2S3 Digital Interface Specifications Interface Type UART Universal Asynchronous Receiver Transmitter Organization Dialog duplex Default Configuration Baud rate...

Страница 36: ...neering unit 0 1 Bool Temperature alarm out of limits Char Temperature trend or Dp String Calculated parameter type nc no calculation Dp dew point Fp frost point 1234 56 Float Calculated numerical val...

Страница 37: ...as described below Settings for the RS485 port on the MD485 must be configured to match the configuration of the HC2S3 which are 19200 baud No Parity 8 Data Bits 1 Stop bit and No Flow Control Device...

Страница 38: ...c Example E 1 Program Measuring the HC2S3 Using RS 485 CR1000 Program Declare variables Public SerialIndest As String 100 Dim String_1 As String Const CRLF CHR 13 CHR 10 Dim HC2S3_Split 17 As String 4...

Страница 39: ...uplex COMport 32 at 19200 baud no parity 1 stop bit and 8 data bits and serial instructions to send the RDD command to get temperature and relative humidity data from the probe Sensor Wiring E2 05XX M...

Страница 40: ...esReturned Const SensorPort 32 SDM SIO1 rotary switch set at 0 DataTable Table1 1 1 DataInterval 0 15 Min 10 Average 1 TempC FP2 False Sample 1 RH FP2 EndTable BeginProg SerialOpen SensorPort 19200 51...

Страница 41: ......

Страница 42: ...Asia Location Bangkok Thailand Email info campbellsci asia Website www campbellsci asia China Location Beijing P R China Email info campbellsci com cn Website www campbellsci com cn Spain Location Ba...

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