Related Manuals for Amit DM-OT2
Summary of Contents for Amit DM-OT2
- Page 1 DM-OT2 Converter of OpenTherm/+ interface Operation manual Version 1.00 dm-ot2_g_en_100...
- Page 2 DM-OT2 AMiT, spol. s r. o. does not provide any warranty concerning the contents of this publication and reserves the right to change the documentation without any obligation to inform anyone or any authority. This document can be copied and redistributed under the following conditions: 1.
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Page 3: Table Of Contents
DM-OT2 Contents Revision history ....................4 Related documentation ................... 4 HW revision history ..................5 Introduction ..................6 Technical parameters ................7 Dimensions ..................... 8 Recommended drawing symbol ..............8 Product nameplate ................9 Manufacturer’s product nameplate ............... 10 Compliance assessment ..............11 Other tests .................... -
Page 4: Revision History
DM-OT2 Revision history Document name: dm-ot2_g_en_100.pdf Revision Date Changes by Changes 04. 09. 2019 Taťák Martin New document. Related documentation Application note AP0008 – Communication in MODBUS RTU network (PseDet) file: ap0008_en_xx.pdf Application note AP0016 – Principles of RS485 interface usage file: ap0016_en_xx.pdf... -
Page 5: Hw Revision History
DM-OT2 HW revision history The HW revision is stated on the nameplate, see 3 “Product nameplate”, item HW. Version Date Changes – 04. 09. 2019 New product. 5/37 dm-ot2_g_en_100... -
Page 6: Introduction
DM-OT2 Introduction DM-OT2 is an OpenTherm/+ (OT/+) interface converter with MODBUS RTU and ARION protocols. It connects to a superior control system through galvanically isolated RS485 serial interface. The converter acts as a room controller with OT/+ interface and therefore allows for control of certain types of boilers. -
Page 7: Technical Parameters
DM-OT2 Technical parameters OpenTherm Surge protector Transil 600 W Galvanic isolation Maximum wire length 30 m Function indication LED on the base plate Connection point Screw terminals Wire cross-section 0.21 mm to 4 mm RS485 Surge protector Transil 600 W... -
Page 8: Dimensions
OK-XX HiPot HiPot-OK DATE 04.11.20 Fig. 1 – DM-OT2 dimensions Recommended drawing symbol The following drawing symbol is recommended for the DM-OT2 converter. Only part of it will be visible in following examples. DM-OT2 COM0 G485 OT/+ +24V Fig. 2 – Recommended drawing symbol for DM-OT2... -
Page 9: Product Nameplate
DM-OT2 Product nameplate Converter DM-OT2 is fitted with a nameplate on the side. For nameplate location, see “Fig. 3 – Nameplate location”. DM-OT2 TYPE: AF23456 HW REV APP 1.00 / LDR 1.00 POWER 24 V DC / 0.03 A WEIGHT 0.09 kg... -
Page 10: Manufacturer's Product Nameplate
DM-OT2 Manufacturer’s product nameplate The information on the nameplate is summarised in the table. For a sample, see “Fig. 4 – Example of an AMiT nameplate”. Description Data Note – Manufacturer’s logo AMiT logo – Manufacturer’s QR code QR code... -
Page 11: Compliance Assessment
DM-OT2 Compliance assessment The device is in compliance with requirements of NV616/2006. The compliance assessment with NV616/2006 has been performed in accordance with harmonised standard EN 61326-1:2006. Tested in accordance Type of test Classification with standards EN 55011:2009 Industrial, scientific and medical Complies equipment –... -
Page 12: Other Tests
DM-OT2 Other tests The device has been tested in accordance with standards: Tested in accordance Type of test Result with standards Environmental testing – Part 2-1: Tests – EN 60068-2-1:2007 Complies Test A: Cold Environmental testing – Part 2-2: Tests –... -
Page 13: Power Supply
DM-OT2 Power supply Converter DM-OT2 may be powered only from a DC power source. The power source must comply with all requirements specified in chapter 2 “Technical parameters”. Fig. 5 – LED PWR and power supply terminal locations Legend Number... - Page 14 DM-OT2 Wiring DM-OT2 example COM0 G485 OT/+ +24V 24 V Fig. 6 – Power supply wiring example Legend Number Significance External power supply source Note The GND terminal must be connected with the switchboard PE terminal during installation. dm-ot2_g_en_100 14/37...
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Page 15: Communication Interface
DM-OT2 Communication interface The DM-OT2 converter is equipped with interfaces: RS485, OpenTherm/+. RS485 Converter features the RS485 interface with galvanic isolation. RS485 is used to connect the converter to the superior system. RS485 interface activity is indicated by LEDs located on the base plate. -
Page 16: Opentherm
DM-OT2 Jumpers Jumpers Significance Terminal station – idle states and termination are active description Fitted Intermediate station – idle states and termination are inactive Not fitted More information about the use of the RS485 interface is available in Application note AP0016 – Principles of RS485 interface usage. - Page 17 DM-OT2 Fig. 9 – Locations of terminals and OpenTherm LEDs Legend Number Significance Terminal OT/+ OT/+ indication LEDs Description of OT/+ LEDs Terminal Terminal Signal Significance labels Interface OT/+ Interface OT/+ Indication Significance LEDs RxOT Is on when data is received from OT/+ network...
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Page 18: Mounting
DM-OT2 Mounting Converter DM-OT2 mounts on a 35 mm DIN rail vertically or horizontally. The position on the DIN rail is secured by a lock in the lower and upper part of the converter. Fig. 10 – Location of the DIN rail lock... -
Page 19: Installation Rules
DM-OT2 Installation rules EMC filter It is recommended to use an EMC filter on the power supply input. This requirement can be revised based on environment nature, power source properties and wiring layout. Power supply The device must not be powered from the DC distribution network of the building. -
Page 20: Converter Settings
DM-OT2 Converter settings To set communication parameters and the protocol on the RS485 interface, there are DIP switches and a jumper on the bottom part of the converter. Fig. 11 – Locations of DIP switches and the MODE jumper used to set... -
Page 21: Address Settings
DM-OT2 Address settings All devices in the network must have unique address. The address can be set by using switches ADR0 to ADR5 and its value can be between 1 and 63. Address 0 is not permitted! Value ADR0 Value 1... -
Page 22: Setting Error Signalisation
DM-OT2 Setting error signalisation In the case of wrong settings, the state is signalised by flashing converter LEDs. In such a case, the converter sends the last know settings into the OT/+ network. dm-ot2_g_en_100 22/37... -
Page 23: Programme Operation - Modbus Rtu Protocol
All values are saved in the big endian order. Name Address Type Description Hardware identification. The number represents the hardware type. 197 = DM-OT2. Firmware version. Time Time. GuardTime Number [ms] for MODBUS RTU communication failure evaluation. Zero value results into permanent disconnection. -
Page 24: Application Registers
DM-OT2 Name Address Type Description Address Address. Reset Reset counter. counter MODBUS MODBUS messages counter. messages DIP state DIP switch setting. Application registers All values are saved in the big endian order. 9.3.1 Input registers It is possible to read the following data from input registers: ... -
Page 25: Holding Registers
DM-OT2 Address Type Description R (Int) Latest error code. Heating water temperature HL1 [°C]. (Float) Heating water temperature HL2 [°C]. (Float) DHW temperature [°C] (Float) Return temperature [°C] (Float) Outdoor temperature [°C]. (Float) Heating source performance [%]. (Float) Pressure [bar]. - Page 26 DM-OT2 exhaust temperature, value of a custom ID register in the OT/+ network, state of read/write of a custom ID register in the OT/+ network. Supported functions: Functions Description Read one / m ultiple holding registers...
- Page 27 DM-OT2 Address Type Description R (Int) The state of reading of register 120 R (Int) Writing status for the OT/+ register entered via the MODBUS holding register 213 In case the ID type of the OT/+ register is f88, the read value from the OT/+ is multiplied by 10 and saved to MODBUS register 120.
- Page 28 DM-OT2 Address Type Description Enable DHW. Enable writing of maximum boiler power permitted. Enable HL2. Set summer mode. Enable reading from OT/+ register the ID of which is in the holding register 216. Enable writing into OT/+ register the ID of which is in the holding register 213.
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Page 29: Programme Operation - Arion Protocol
OT/+ network peripheral. This behaviour is firmly set in the converter and cannot be changed. To operate one DM-OT2 converter connected into ARION communication network as an autonomous node (see Application note AP0025 – Communication in ARION network – table definition), use an item in the “DM-OT”... -
Page 30: Digital Outputs
DM-OT2 Logical level description: The bit value in the Significance digital inputs channel 10.2 Digital outputs Digital outputs make it possible to set: blocking writing of HL1 hot water temperature setpoint, blocking writing of HL2 hot water temperature setpoint, ... -
Page 31: Analogue Inputs
DM-OT2 10.3 Analogue inputs Analogue inputs transfer: hot water temperature in HL1, hot water temperature in HL2, DHW temperature, return water temperature, outdoor temperature, heating source performance, water pressure, flowrate, exhaust fumes temperature, ... - Page 32 DM-OT2 Settings of parameters ElMin / ElMax, PhysMin / PhysMax depend on what units are required for the measured value from the ARI_AnIn module. For signals 0 to 3 and 9: Parameter Value ElMin ElMax PhysMin PhysMax For signal 4:...
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Page 33: Analogue Outputs
DM-OT2 10.4 Analogue outputs Analogue inputs make it possible to set: HL1 hot water temperature setpoint, HL2 hot water temperature setpoint, DHW temperature setpoint, room temperature setpoint for HL1, room temperature setpoint for HL2, maximum boiler power permitted. -
Page 34: Factory Settings
DM-OT2 11 Factory settings RS485 Jumpers to activate termination and idle state definition are fitted on the configuration interface RS485. DIP switch All DIP switches are in the OFF position. It is necessary to set communication parameters, application and protocol, see chapter 8.1 “Address settings”, chapter 8.2 “Setting communication speed and parity”. -
Page 35: Ordering Information And Package Contents
DM-OT2 12 Ordering information and package contents Complete set, see chapter 12.1 “Package contents” Converter DM-OT2 12.1 Package contents DM-OT2 Part Quantity Converter of OpenTherm/+ interface 35/37 dm-ot2_g_en_100... -
Page 36: Maintenance
DM-OT2 13 Maintenance With exception of cleaning, the device requires no periodic inspections or maintenance. Cleaning Depending on the device usage, it is necessary to clean the dust out of the device from time to time. The device can be cleaned with a dry, soft brush or a vacuum cleaner and only while turned-off and disassembled. -
Page 37: Waste Disposal
DM-OT2 14 Waste disposal Electronics The product disposal is subject to regulations on disposal of electronic waste. disposal The equipment must not be disposed together with common public waste. It has to be delivered to relevant facilities and recycled. 37/37...
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