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STS DTM.OCS.S Operating Manual

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Inhalt
Operating manual
Digital Transmitter DTM.OCS.S / DTM.OCS.S/N
Doc. No. 10.00.0430
Version: 01.11.2018
These operating instructions must be read by the operator before operation and installation!
Translation of the original operating manual

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  • Page 1 Inhalt Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Doc. No. 10.00.0430 Version: 01.11.2018 These operating instructions must be read by the operator before operation and installation! Translation of the original operating manual...
  • Page 2 Doc-Nr. 10.00.0430...

  • Page 3: Table Of Contents

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Inhalt Introduction ................6 Requirements/Basics ............. 6 Abbreviations ..............6 Limitation of Liability ............6 Copyright Protection ............7 Spare Parts ..............7 Guarantee Provisions ............ 7 Customer Service ............7 Registered Trademarks ..........8 Reference Documentation ..........
  • Page 4 Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Inhalt Modbus standard commands ..........21 Read pressure value (P) ..........21 6.1.1 Command (Hex-Code, Function Code 4) ..21 6.1.2 Interpretation start index 0: Measured pressure value ..........21 Read temperature-value (T) .........21 6.2.1 Command (Hex-Code, Function Code 4) ..21 6.2.2...
  • Page 5 Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Inhalt Troubleshooting ..............29 Error messages when using STS Modbus commands ..............29 Error messages when using Modbus standard commands ..............29 9.2.1 General ............29 9.2.2 Exception codes ........... 29 10 Appendix ................30 10.1 Mapping of Modbus command codes ......

  • Page 6: Introduction

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Introduction Introduction 1.1 Requirements/Basics You need basic knowledge of Modbus. 1.2 Abbreviations Abbreviation Meaning Digital Transmitter Open Communication System Pressure Zero-point pressure Nominal pressure Temperature Data word Data byte Protocol Data Unit Tab. 1: Abbreviations...

  • Page 7: Copyright Protection

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Introduction Warranty The manufacturer guarantees for the function of the applied process technology and the indicated performance parameters. The warranty period shall commence at the time of delivery of the device to the customer.

  • Page 8: Registered Trademarks

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Introduction 1.8 Registered Trademarks Any brand and product names are registered trademarks of the respective companies and organizations. 1.9 Reference Documentation  MODBUS over Serial Line, Specification & Implementation Guide V1.0 http://www.modbus.org Modbus Standard Library section ...

  • Page 9: Safety

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Safety Safety 2.1 Intended Use The intended use of the Digital Transmitter DTM.OCS.S and DTM.OCS.S/N is the measuring of pressure and temperature and the transmitting of the values in real time to the interface RS485 using Modbus RTU protocol.

  • Page 10: Product Overview

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Product overview Product overview Fig. 1: Product overview Digital Transmitter DTM.OCS.S Operating and safety instructions Digital Transmitter The operating manual can be downloaded from the STS homepage. Doc-Nr. 10.00.0430...

  • Page 11: Commissioning Of The Digital Transmitter

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Commissioning of the Digital Transmitter Commissioning of the Digital Transmitter 4.1 Unpacking The digital transmitter is delivered in product-specific packaging that protects it outstandingly under regular transport conditions. Check the packaging for outward damage. Take out the transmitter carefully and without applying any force.

  • Page 12: Installation

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Commissioning of the Digital Transmitter NOTE! Some digital transmitters are delivered with a yellow protective cap for the pressure connection. Remove the flap before you use the digital transmitter.  Do not connect the digital transmitter in the direct proximity of motors, pumps, valves, heat sources or other possible interference sources.

  • Page 13: Communication With The Dtm.ocs.s Transmitter

    Hi – Lo byte Data words: Lo – Hi byte CRC: For the communication with the DTM.OCS.S, standard Modbus commands (Function Codes 3, 4 and 16) and a custom STS function code (0x64 [100 ]) are used. Doc-Nr. 10.00.0430...

  • Page 14: General Modbus Message Frame Structure

    CRC checksum is provided), no response is given. 5.4 Modbus STS commands 5.4.1 STS command structure For the communication with the DTM.OCS.S, a custom STS function code is used: 0x64 (100 FC Code data size STS command and its parameter(s) (ASCII encoded strings) 1 ≤...

  • Page 15: List Of Sts Commands

    Internal error Tab. 5: Status messages For a detailed example please see chapter 5.4.4. 5.4.3 List of STS commands Listed below are the provided STS commands and their associated parameters. Commands may be called with multiple parameters combined. 5.4.3.1 MEASURE The MEASURE command reads out the currently present pressure and temperature.
  • Page 16 Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Communication with the DTM.OCS.S transmitter Parameter Example Exemplary answer Description -REF_V -REF_V 0.45 sets the reference value tare and dtw are referring to  0.45 mH2O -SAVE -SAVE used to save the provided settings NOTE! Provided settings will only be saved permanently, if “-SAVE”...

  • Page 17: Supported Pressure Units

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Communication with the DTM.OCS.S transmitter 5.4.3.2 Supported pressure units Unit Description mH2O Meter of water column at 4 °C cmH2O Centimeter of water column at 4 °C mmH2O Millimeter of water column at 4 °C ftH2O Water column at 4 °C (in ft)

  • Page 18: Supported Temperature Units

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Communication with the DTM.OCS.S transmitter Hectopascal Kilopascal Megapascal Gigapascal N/m2 Newton per square meter kN/m2 Kilonewton per square meter MN/m2 Meganewton per square meter GN/m2 Giganewton per square meter N/mm2 Newton per square millimeter...

  • Page 19: Sts Modbus Commands Under The Magnifying Glass

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Communication with the DTM.OCS.S transmitter 5.4.4 STS Modbus commands under the magnifying glass Below a very detailed example including hex codes on a byte level is presented to allow a more comprehensive understanding of the command structure.
  • Page 20 Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Communication with the DTM.OCS.S transmitter --------------------------------------------- data --------------------------------------------- byte code: ‚P‘ ‚ ' ‚1‘ ‚0‘ ‚.‘ ‚2' ‚5' ‚0' ‚0' ‚ ' ‚-' ‚P' ‚U' interpretation: transmit sequence --------------------------------------------- data --------------------------------------------- byte code: ‚m‘...

  • Page 21: Modbus Standard Commands

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Modbus standard commands Modbus standard commands This chapter describes the Modbus standard command set supported by the DTM.OCS.S. Function Codes 3, 4 and 16 are used. NOTE! The following commands are all using the default Modbus device address 240 (0xF0)! 6.1 Read pressure value (P)

  • Page 22: Read Pressure And Temperature In One Command

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Modbus standard commands = -10°C, T = 50°C Function Address Start index Length code byte code: format: byte byte high byte low byte high byte low byte high transmit sequence Example answer (in hex format) for a sensor with the address...

  • Page 23: Read Minimal Pressure

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Modbus standard commands  Calculation: P = PMax2 * 65536 + PMax1 If PMax > 2 PMax = (PMax2 * 65536 + PMax1) - 2 PMax  100000 Example: PMax1 = 54464 PMax2 = 1 ->...

  • Page 24: Read Maximum Temperature (End Of Temperature Range, Tmax )

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Modbus standard commands 6.6 Read maximum temperature (end of temperature range, T 6.6.1 Command (Hex-Code, Function Code 3) Example transmission code (in hex format) for a sensor with the address 240 F0 03 00 CC 00 02 11 15 6.6.2 Interpretation start index 204+205: End of temperature range...

  • Page 25: Change Device's Modbus Address

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Modbus standard commands 6.9 Change device’s Modbus address 6.9.1 Command (Hex-Code, Function Code 16) Start index is 20 Example transmission code (in hex format) to change its address from 240 ) to address 222 F0 10 00 14 00 01 02 00 DE 2C 88 Value range: 16bit unsigned integer (0...65536), nominal 1…247.
  • Page 26 Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Modbus standard commands FWU16  Description: firmware version  Calculation: fw = FWU16/100 Example answer (in hex format) for a sensor with the address F0 04 02 00 70 C5 01 FWU16 = 0070 = 112 ...

  • Page 27: Technical Data

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Technical Data Technical Data Refer to the data sheet of the Digital Transmitter DTM.OCS.S. Doc-Nr. 10.00.0430...

  • Page 28: Maintenance

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Maintenance Maintenance Interval Maintenance work Regularly, depending on the Clean the membrane of the Digital Transmitter in case of strong pollution. medium that is monitored. In case of uncertainty, contact your STS distribution partner.

  • Page 29: Troubleshooting

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Troubleshooting Troubleshooting 9.1 Error messages when using STS Modbus commands Fault Possible cause Troubleshooting Digital Transmitter The device is busy. Try again later. responds with BUSY Digital Transmitter The command execution has failed.

  • Page 30: Appendix

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Appendix 10 Appendix 10.1 Mapping of Modbus command codes Some Modbus implementations use a different way to address the desired data fields. The following table might be of use in these cases: Value to get...

  • Page 31: Revision History

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Revision history 11 Revision history Revision date Chapter Page Change Reason for change 5.4.3.2 Supported pressure units Extension of pressure units 01.11.2018 Doc-Nr. 10.00.0430...

  • Page 32: Index

    Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Index Index Modbus standard commands ......21 Modbus STS commands ........14 Abbreviations ............6 Physical interface ..........13 Cleaning the membrane ........28 Product overview..........10 Commissioning ..........11 Purpose ..............9 Communication with the DTM.OCS.S transmitter ............
  • Page 33 Companies of the STS Group Switzerland Italy STS Sensor Technik Sirnach AG STS Italia s.r.l Rütihofstrasse 8 Via Gesu 5 CH - 8370 Sirnach, Switzerland I - 20090 Opera (MI), Italy Phone: +41 (0)71 969 49 29 Phone: +39 02 5760 7073...

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