Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Doc. No. 10.00.0430 Version: 11.08.2015 These operating instructions must be read by the operator before operation and installation! Translation of the original operating manual

Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N

Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Command (Hex-Code, Function Code 16) ...25

Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N

Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N 1.1 Requirements/Basics You need basic knowledge of Modbus. Digital Transmitter Open Communication System Zero-point pressure Nominal pressure Data word Data byte Protocol Data Unit Limitation of Liability All information and notes in these instructions have been put together under consideration of the applicable standards and provisions, the state of the art and our many years of insights and experiences. The manufacturer assumes no liability for damage due to:  Non-observation of these instructions  Non-intended use  Use of untrained...

Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N 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. Components shall be excluded from the guarantee and claims for defects if the damage has been caused by wear. 1.4 Copyright Protection The operating instructions must not be provided to any third parties without the written consent of the manufacturer. NOTE! The content, texts, drawings, pictures and other illustrations are copyright-protected...

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  MODBUS Application Protocol Specification V1.1 http://www.modbus.org Modbus Standard Library section  STS Website http://www.stssensors.com Datasheets and general product information

Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N 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. The use in acids / bases is only possible to a limited extent. Application and medium compatibility must be coordinated with STS before commissioning or when ordering. Only use the device as intended. All information in the operating instructions must be complied with. The operator shall be solely liable for...

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.

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. 4.2 Safety Notes CAUTION! Check the values on the rating plate, and particularly the pressure range. These values must correspond to the required technical data. The seals are made of Viton (FPM), unless...

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.  Protect the membranes from damage. Do not touch the membranes.  Digital transmitter with cable output: Avoid damage to the cable jacket. Observe the maximum permitted medium temperature of the...

Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Communication with the DTM.OCS.S transmitter Communication with the DTM.OCS.S transmitter 5.1 Summary Communication with the DTM.OCS.S is accomplished via an RS485 serial interface using Modbus protocol transfers at 9600 baud. STS specific, proprietary commands are transmitted as ASCII strings embedded in Modbus compatible data frames. Modbus standard function codes are supported as well. The following settings apply: Type Transmission mode Default address Transmission rate Data bits Stop bits 5.2 Physical interface For communication...

Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Communication with the DTM.OCS.S transmitter 5.3.2 General Modbus message frame structure Message frame: Modbus message (command or response) Modbus PDU Modbus Serial Line PDU Tab. 3: Modbus message frame The number of data words can be derived from the definition of the respective commands. The CRC checksum is divided into two individual bytes with the low byte being transmitted first, followed by the high byte. The CRC checksum is calculated using address, function code and the data words. If the message is faulty (e.g. an invalid...

Operating manual Digital Transmitter DTM.OCS.S / DTM.OCS.S/N Communication with the DTM.OCS.S transmitter Status message Command has been executed successfully Command execution has been failed The device is busy, try again later 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. Exemplary answer reads out...