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Sentek SDI-12 II Series Manual

Probe interface
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Probe Interface Manual Version 1.1
(For firmware revision 1.3.4 or above)

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Summary of Contents for Sentek SDI-12 II Series

  • Page 1 Probe Interface Manual Version 1.1 (For firmware revision 1.3.4 or above)
  • Page 2 All rights reserved. No part of this document may be reproduced, transcribed, translated into any language or transmitted in any form electronic or mechanical for any purpose whatsoever without the prior written consent of Sentek Pty Ltd. All intellectual and property rights remain with Sentek Pty Ltd. All information presented is subject to change without notice.

  • Page 3: Sentek - Statements Of Compliance

    Any modifications to any part of the equipment or to any peripherals may void the EMC compliance of the equipment. Radio Interference The probe is not to be operated in free air as it may cause interference to radio communication devices Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page ii...

  • Page 4: Table Of Contents

    What part of the soil profile do multiple sensors on the probe measure? ....22 Salinity Management ......................22 Appendix B - Sensor Specifications ..............23 EasyAG sensors ........................23 EnviroSCAN sensors ......................23 Appendix C- Troubleshooting ................24 Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page iii...
  • Page 5 Table of Figures Figure 1 Intelligent Probe Configuration Utility software ................... 2 Figure 2 Sentek SDI-12 probe interface communication power sequence ............... 6 Figure 3 Voltage levels on the SDI-12 line during an Acknowledge Active command (a!) ........6 Figure 4: EnviroSCAN SDI-12 probe interface board layout .................. 16 Figure 5 EasyAG SDI-12 probe interface board layout ....................

  • Page 6: The Enviroscan And Easyag Sdi-12 Probe Interface

    The EnviroSCAN and EasyAG SDI-12 probe interfaces are used to allow an SDI-12 compatible device to communicate with and retrieve data from multiple Sentek sensors installed on a single probe. Both EnviroSCAN and EasyAG SDI-12 probe interfaces behave as a slave device, meaning they are not capable of logging information or sampling data themselves.

  • Page 7: Setting The Probe Configuration

    It is possible to change the calibration coefficients through the Probe Configuration Utility:  Moisture sensor A,B,C values should only be changed to reflect the characteristics of the soil in which the probe is installed. See the Sentek Calibration Manual for further information.  Salinity sensor ABC values should not be changed.
  • Page 8 Sentek SDI-12 Series II Probe Manual Setting the SDI-12 Address The address of the probe should be in the range "0" to "9", "A" to "Z" and "a" to "z". Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 3...

  • Page 9: Sdi-12 Probe Interface

    (mm/10cm) readings being reported to the controlling device. For more information on setting up the EnviroSCAN and EasyAG SDI-12 probe interface, refer to the Intelligent Probe Configuration Utility online help. Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 4...

  • Page 10: Sdi-12 Communication

    Note: Valid communication must have an SDI-12 address included in the command that matches that of the probe interface, and in the format of a valid SDI-12 command. Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 5...

  • Page 11: Timing

    Each character transmitted consists of a Start Bit (spacing), followed by 7 data bits, followed by an even parity bit, followed by a stop bit (marking). Characters are transmitted least significant bit (LSB) first with each bit in the character being 0.833ms wide. Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 6...

  • Page 12: Addresses

    Note 1: Valid soil moisture values will always be in the range +000.0000 to +101.0000. Soil moisture data which would result in values in the range -0.1 to 0.0 will be returned as +000.0000. Any soil Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 7...

  • Page 13: Data Reading Using The Start Measurement Command (Am! Or Amn!)

    Send Data commands (aDn!) to read the values. Command Response aD0! a+002.0010+003.1234+001.0200<CR><LF> aD1! a+011.1234+001.0100+011.3344<CR><LF> aD2! a+012.0230<CR><LF> Note: The Send Data commands (aDn!) must be issued in increasing order. Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 8...
  • Page 14 If there are more than 9 temperature values, a further Start Measurement command (aM5!) must be issued. Command Response aM5! a0027<CR><LF> Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 9...

  • Page 15: Data Reading Using The Start Concurrent Measurement Command (Ac! Or Acn!)

    The response indicates that 16 salinity values will be available after 36 seconds. The controlling device will then issue Send Data commands (aDn!) to read the values. Command Response aD0! a+001.0000+001.1234+000.0200+000.1234+000.0000 +123.1234+010.1200+000.1243<CR><LF> aD1! a+044.8750+002.0010+003.1234+001.0200+011.1234 Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 10...
  • Page 16 The response indicates that 16 B constant values will be available after 1second. The controlling device will then issue Send Data commands (aDn!) to read the values. Command Response aD0! a+000.4040+000.4040+000.4040+000.4040+000.4040 +000.4040+000.4040+000.4040<CR><LF> aD1! a+000.4040+000.4040+000.4040+000.4040+000.4040 +000.4040+000.4040+000.4040<CR><LF> Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 11...
  • Page 17 +140.0000+150.0000+160.0000<CR><LF> Temperature and Humidity Sensor Depth Values These values are not available through SDI-12 commands. They can be viewed and changed using the Probe Configuration Utility. Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 12...

  • Page 18: Identification

    (CRC). The serial number reported via SDI-12 omits the first and last 8 bits, providing the remaining 48 bits as the serial number. The serial number for the above example is: 10C4223800000097 As reported by Probe Configuration Utility C42238000000 As reported by SDI-12 Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 13...

  • Page 19: Supported Commands

    Refer to "Data Reading" section n in range "0" - "9" Start a0000<CR><LF> verification aRn! Continuous a<CR><LF> Measurement Not supported Probe interface will respond with its address Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 14...

  • Page 20: Extended Commands Supported

    Sentek SDI-12 Series II Probe Manual Extended Commands Supported There are no extended commands supported by the EnviroSCAN and EasyAG SDI-12 probe interface. Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 15...

  • Page 21: Enviroscan Technical Specifications

    0.100 seconds maximum (TriSCAN) Maximum sensors supported: 16 Moisture sensors or 16 TriSCAN sensors And 16 temperature and humidity sensors Figure 4: EnviroSCAN SDI-12 probe interface board layout Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 16...
  • Page 22 120ms. These two graphs were prepared from a sample EnviroSCAN PCB revision 2.4 manufactured in 2012. Other revisions may have slightly different characteristics. Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 17...

  • Page 23: Easyag Technical Specifications

    Figure 5 EasyAG SDI-12 probe interface board layout EasyAG Current consumption: Typical initial power on characteristic at 5.5V is maximum current draw 200mA and the interface enters the idle state after about 120ms. Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 18...
  • Page 24 Sentek SDI-12 Series II Probe Manual These two graphs were prepared from a sample EasyAG PCB revision 2.3 manufactured in 2012. Other revisions may have slightly different characteristics. Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 19...

  • Page 25: Circuit Information

    Figure 6: SDI-12 interface circuit diagram 74HC14 74HC14 6 PIN MICROSPOX +V CC TTL-TXD1 TXD1 74HC14 74HC14 TTL-RXD1 RXD1 PROGRAMMING JUMPER BAR43 PROGRAMMING JUMPER Figure 7 TTL interface circuit diagram Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 20...

  • Page 26: Appendix A - Soil Moisture And Salinity Management

    Q. What does 1mm volumetric water content / 10cm soil depth mean? A. You require one(1) litre of water to cover one(1) square meter (m²) to a soil depth of one(1) millimetre. Figure 8: Measurements using metric units Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 21...

  • Page 27: What Part Of The Soil Profile Do Multiple Sensors On The Probe Measure

    0-10cm. For the other sensors at 10cm depth intervals on the probe rod, the measurement depth would be respectively (20-30cm, 30-40cm and so on). Figure 10: Measurements of multiple sensors on the probe Salinity Management Please refer to the TriSCAN Agronomic User Manual Copyright © 2001 – 2014 Sentek Pty Ltd All rights reserved Page 22...

  • Page 28: Appendix B - Sensor Specifications

    Sentek SDI-12 Series II Probe Manual Appendix B - Sensor Specifications NOTE: All assembly and configuring of sensors should be performed by trained personnel e.g. Sentek Distributors. EasyAG sensors EasyAG sensors are supplied in four standard configurations:  3 or 5 Moisture sensors at consecutive 10cm intervals ...

  • Page 29: Appendix C- Troubleshooting

    Sentek SDI-12 Series II Probe Manual Appendix C- Troubleshooting This section assumes that the person is trained in installation and configuring Sentek probes. Symptom or error message Possible cause Possible solution PConfig Timeout while The wrong COM port has Try every COM port in the...

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