Campbell SDMS40 Instruction Manual
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Campbell SDMS40 Instruction Manual

Multipoint scanning snowfall sensor
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SDMS40
Multipoint Scanning Snowfall Sensor
February 2018
Copyright © 2018
Campbell Scientific (Canada) Corp.

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  • Page 1 SDMS40 Multipoint Scanning Snowfall Sensor February 2018 Copyright © 2018 Campbell Scientific (Canada) Corp.
  • Page 3 WARRANTY AND ASSISTANCE This equipment is warranted by CAMPBELL SCIENTIFIC (CANADA) CORP. ("CSC") to be free from defects in materials and workmanship under normal use and service for ***** twenty-four (24) months from date of shipment unless specified otherwise. ***** Batteries are not warranted.
  • Page 4 (780) 454-2655. Campbell Scientific (Canada) Corp. is unable to process any returns until we receive this form. If the form is not received within three days of product receipt or is incomplete, the product will be returned to the client at the client’s expense.
  • Page 5 Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CLIENT ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.

  • Page 6: Table Of Contents

    2. Precautions ..............2 3. Initial Inspection ............2 4. Specifications ............. 2 5. Mounting ..............3 Adjusting Inclination Angle or Direction of the SDMS40 ....4 6. Powering Up ............... 5 7. SDI-12 Output ............. 5 SDI-12 Quick Start................5 SDI-12 Operation .................
  • Page 7 Table of Contents Tables TABLE 5-1. SDMS40 Mounting Procedure ..........4 TABLE 7-1. Set up wiring for SDI-12 ............5 TABLE 7-2. SDI-12 Command List .............. 6 TABLE 7-3. Power Wiring ................7 TABLE 7-4. SDI-12 Wiring ................7 TABLE 8-1. Setup Wiring for RS-232 ............10 TABLE 8-2.

  • Page 9: Introduction

    Once it completes a set of measurements, the SDMS40 takes an intelligent average of the depths to provide a representative average snow depth of the target area.

  • Page 10: Precautions

    The SDMS40 is set with the SDI-12 or RS-232 output configuration by the manufacturer. Precautions The SDMS40 uses a Class 2 laser. Do not stare into the laser beam. Initial Inspection • Upon receipt of the SDMS40, inspect the packaging and contents for damage.

  • Page 11: Mounting

    It is not intended for operation under water. All this is required is an appropriate mounting fixture. Position the SDMS40 about one meter above the maximum seasonal snow depth height. This provides adequate height for required accuracy and resolution.

  • Page 12: Adjusting Inclination Angle Or Direction Of The Sdms40

    Adjusting Inclination Angle or Direction of the SDMS40 The SDMS40 can be installed at any angle between 0 and 45 degrees from the pole. After loosely tightening the screw on the common hole (see Figure 5-1 SDMS40), the inclination angle can be adjusted in 5 degree increments by matching one of the six holes on the flat backed mount attached to the pole (see Figure 5-2 SDMS40 Mounting angles).

  • Page 13: Powering Up

    SDMS40 Multipoint Scanning Snowfall Sensor Powering Up The SDMS40 requires a 12-15 Vdc power supply capable of providing up to 2 Amps continuously. Note To avoid shock or damage to the instrument, never apply power while working on wiring and connections.

  • Page 14: Sdi-12 Operation

    7.2.1 SDI-12 Command List The SDMS40 supports many of the SDI-12 features and specifications. Table 7-2 SDI-12 Command List is a list of current SDI-12 commands and responses to commands, where ‘a’ is the address of the sensor.

  • Page 15: Sdi-12 Wiring

    SDMS40 Multipoint Scanning Snowfall Sensor Reset the sensor ground level. This command would aXGxx! 0501 be used with the offset if there is existing snow on the ground when the sensor is installed. “a” refers to the address of the sensor.

  • Page 16: Crbasic Example 7-1. Sdi-12

    Black and Brown (GND)= G '********************************************************************************* Constants '********************************************************************************* Const SDMS40_Interval = 1 'in minutes Const SDI12_PORT1 = 1 ' C1 is the Communications port used for connection to SDMS40 '********************************************************************************* Diagnostic variables '********************************************************************************* Public PTemp, batt_volt Units PTemp = deg C...

  • Page 17: Rs-232 Output

    Sample (1,status.WatchdogErrors,UINT2) EndTable '********************************************************************************* Snow Depth Data Table '********************************************************************************* DataTable(SnowDepth,1,-1) DataInterval (0,SDMS40_Interval,min,10) Sample(1,SDI_Snow_Depth_Avg_1,FP2) EndTable '********************************************************************************* Subroutine: CalibrateSensors Description: Sends an auto-calibration command to the SDMS40. '********************************************************************************* Sub CalibrateSensors SDI12Recorder(SDI_Calibrate_Return,SDI12_PORT1,0,"XA!",1,0,-1,1) Delay (1,10,Sec) EndSub '********************************************************************************* Main Program '********************************************************************************* BeginProg Scan (10,Sec,5,0) PanelTemp (PTemp,_60Hz)

  • Page 18: Rs-232 Quick Start

    SDMS40 Multipoint Scanning Snowfall Sensor RS-232 Quick Start Use Table 8-1 Setup Wiring for RS-232 when setting up the SDMS40 to communicate to a Campbell Scientific datalogger via RS-232. TABLE 8-1. Setup Wiring for RS-232 Step Procedure Connect the Black cable wire from the sensor to a 12-15 Vdc, 2 Amp power supply’s ground.

  • Page 19: 8.2.1 Rs-232 Command List

    @m⏎ Run a round of measurements immediately. SDMS40 status. This shows various system information such as current firmware version @s⏎ and installation angle and height. Perform automatic calibration to determine @ac⏎...

  • Page 20: Rs-232 Wiring

    SDMS40 Multipoint Scanning Snowfall Sensor RS-232 Wiring The cable/connector assembly provides the RS-232 connections outlined below: • 12-15 Vdc, 2 Amp power supply • Full duplex RS-232 interface for external loggers Align markers on the male and female connectors to plug in and fasten the cable to the sensor.
  • Page 21 Alias SDMS40_Temperature(2) = SDMS40_Laser_Temperature Public SDMS40_Depth_Points(36) Units SDMS40_Depth_Points() = mm Public SDMS40_Distance_Points(36) Units SDMS40_Distance_Points() = mm Dim SDMS40_string As String * 2000 'string to hold data string received from SDMS40 Dim SDMS40_string_temp As String * 2000 Dim SDMS40_Serial_Check '********************************************************************************* 'Snow depth data table...
  • Page 22 SDMS40 Multipoint Scanning Snowfall Sensor 'Retrieve install angle and height from the sensor SerialOut (SDMS40_COMport,"@s" + CHR(13),"",0,0) SerialIn (SDMS40_string,SDMS40_COMport,1000,"",2000) SplitStr(SDMS40_string_temp,SDMS40_string,"angle:",1,4) SplitStr(SDMS40_Install_Angle,SDMS40_string_temp,"",1,0) SplitStr(SDMS40_string_temp,SDMS40_string,"Height:",1,4) SplitStr(SDMS40_Install_Height,SDMS40_string_temp,"",1,0) Scan (10,Sec,5,0) PanelTemp (PTemp,_60Hz) Battery (batt_volt) 'The user's programming for other sensors would go here in the main scan...

  • Page 23: Maintenance

    10.1 Automatic Calibration SDMS40 supports a fully automatic calibration process, which automatically calculates the height and inclination angle of the SDMS40. If the sensor is moved, it requires recalibration. This is done by issuing a calibration request command (SDI-12 “aXA!” or RS-232 “@a”). When using the RS-232 command, the sensor will ask to confirm the request.
  • Page 24 SDMS40 Multipoint Scanning Snowfall Sensor Step Procedure Wire the SDMS40 sensor to the DB9 female terminal block (see Table XXX). Connect the DB9 female to your computer’s RS-232 port using a standard serial cable or to a USB port using a serial-to-USB adapter.

  • Page 25: Table 11-2. Firmware Update Wiring

    SDMS40 Multipoint Scanning Snowfall Sensor The firmware update may take a few minutes. Upon successful completion, an XXXXXX bytes uploaded message will appear. TABLE 11-2. Firmware Update Wiring Color Function Connection White* Firmware reset Pin 4 Blue Pin 3 Yellow...
  • Page 27 Campbell Scienti c (Canada) Corp. | 14532 131 Avenue NW | Edmonton AB T5L 4X4 | 780.454.2505 | www.campbellsci.ca AUSTRALIA | BRAZIL | CANADA | COSTA RICA | FRANCE | GERMANY | SOUTH AFRICA | SPAIN | UNITED KINGDOM | USA...

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