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ESP32 OpenTherm Wi-Fi Thermostat Sketch. Download sketch from DIYLESS github repository esp32-wifi-thermostat. Paste your auth token, specify WI-FI SSID, WI-FI password and update pins configuration according to which module you want to use ESP8266 or ESP32. Connect WeMos D1 Mini or WeMos D1 Mini ESP32 module …OpenTherm Library for HVAC system control communication using Arduino and ESP8266/ESP32 hardware. OpenTherm Library is based on OpenTherm protocol specification v2.2 and works with all OpenTherm compatible boilers. Author: Ihor Melnyk. Maintainer: Ihor Melnyk. Read the ...OpenTherm connection. OT OpenTherm connection; OT OpenTherm connection; Putting the Device into Operation Remove the front cover of the transmitter and insert 2× 1.5 V AA alkaline batteries. Do not use 1.2 V rechargeable batteries. Insertion of batteries starts the thermostat and activates the display.I'm using HomeAssistant with an OpenTherm gateway (classic version with Ser2USB-cable). It's directly connected to my Raspy (I tried direct USB connection or via powered hub) and I'm facing stability issues. Sometimes, the interface just stops working, the different monitor values are no longer updated. Sometimes I find some otgw-related ...Nov 17, 2023 ... ... Opentherm? 06:30 - Other Heatmiser Systems 09:13 - How does it ... Opentherm cable? 24:40 - Wiring for On/Off Control 39:54 - Installing for ...OpenTherm is een taal waarin compatibele thermostaten en verwarmingssystemen met elkaar kunnen communiceren. Zo kunnen thermostaten verwarmings- en warmwatersystemen regelen. De volgende Google Nest-thermostaten ondersteunen OpenTherm: Nest Thermostat E. 3e generatie Nest Learning Thermostat.Configuration. In Homebridge's config.json you need to specify Homebridge OTGW as a platform plugin. Furthermore, you can specify the hostname and port of the OTM web server. When not specified, the default localhost:8080 is used. Optionally, you can specify the hostname and port of the NodeMCU serial server in the OTGW:OpenTherm interface Turn boiler OFF, then ON Check communication cable on Terminals X3.3, X3.4 or X21.1, X21.2 on boiler controls. Check connection on Input Module sub-base Terminals 12, 13. Check 24VAC output of PPM of the boiler Terminals X4.3, X4.4 (RT Terminals). Check for 0-10VDC input signal (a min. of 3.0 V is required to start up the ...OpenTherm is a type of communication system that allows your gas boiler and room thermostat to interact with each other more effectively. Many homes that have a gas boiler will usually have a thermostat to help control the heating. This is so that the boiler understands when the set temperature has been reached and when it no longer needs to ...Ideal instructions for opentherm, and what the opentherm wiring connections look like. I have tried to simply remove the purple link and wire the opentherm to the heat link with no luck. Worth noting the next and heat link were successfully connnecting via opentherm to the old logic boiler I had replaced - so no issues with heat link or wires.Pressure in the heating system. Gateway status (depending on errors and connection status) Boiler connection status via OpenTherm interface. The current temperature of the heat carrier (usually the return heat carrier) Set heat carrier temperature (depending on the selected mode) Current hot water temperature. Home Assistant integration via MQTT.OpenTherm Thermostat Shield. There's a variety of OpenTherm thermostats out there. Most smart thermostats cost from €100 to €300, which is quite expensive. This article describes how to build your own smart OpenTherm Thermostat with remote control for a cheap price and without any monthly costs. We provide a simple solution, which gives you ...I like the suggestion as I know the connection between boiler and adapter is symmetrical, but between adapter and WeMos definitely is not. I swapped GPIO's , so it is now: D2/GPIO4 = OpenTherm RX; D1/GPIO5 = OpenTherm TX; and result isAccording to OpenTherm protocol version 2.2 specification: The master must communicate at least every 1 sec (+15% tolerance). This is probably true for a heating appliance but in case of connection with Brink Renovent only I have noticed that communication works also when conversation frames are sent with longer interval (ex 10 sec).#EPH EPH Controls How To Wire. Viva Training Academy shows us how to wire an EPH Combi Pack 4 on open thermhttps://www.youtube.com/watch?v=hmAnfVEUE5sSmart T...Does anyone know if its possible to connect an Opentherm thermostat such as a Nest to a Baxi 800 System boiler. I know its possible with a Baxi 800 Combi but I cannot find any information on achieving this with a system boiler. I wondered if its possible to control the radiator flow temperature with say a Nest connected to the opentherm …The documentation tells that ID is explained as: The gateway_id for this OpenTherm Gateway's entity IDs and services. The entered value will be slugified. I have no idea what that is. Or is it that 'name' is not the prefix for the entities? Ok, then the introduction text of the add integration dialog could be perhaps something like this:RTH6360D1002 Honeywell home T3 / home owners thermostat get it at most home improvement stores. How to wire it up and configure it to your specific needs wea...I'm using HomeAssistant with an OpenTherm gateway (classic version with Ser2USB-cable). It's directly connected to my Raspy (I tried direct USB connection or via powered hub) and I'm facing stability issues. Sometimes, the interface just stops working, the different monitor values are no longer updated. Sometimes I find some otgw-related ...Aug 29, 2019 · 4.2 remove MSB-LSB note in the centre of the data-value definition. 5.1 correct description of message classes (six to seven). 5.2 insert table to define all …I thought Nest worked with either the relay contacts or Opentherm, but not both. Someone correct me if I am wrong. I assume you were not using Opentherm with your old boiler. How was the programmer and thermostats connected? Easiest to replace those connections, not convert from relay based to Opentherm.Product Code ESRTP4RF . Wireless Programmable Room Thermostat . The ESRTP4RF is a 7 day, 5/2 or 24 hour wireless programmable room thermostat. This removes the need for any fixed wiring between the thermostat and boiler, reducing the installation time and eliminating the chance of damaging the aesthetics of the property, with no redecorating or making good required afterwards.The binding is designed to support various ways of connecting to the OpenTherm Gateway device, but currently only supports a TCP socket connection. The configuration settings for the thing are Hostname/IP address and Port, which are used to connect to the gateway, and an automatic connection retry interval in case the connection to the ...Finally, I believe, although denied by Tado and Chappee supports, Opentherm is functioning with my boiler--Chappee Sempra Nova HTE. The tricky point may be the exact production date: week 26 of 2017. It seems that starting from November 2017 the boiler use R-bus interface, in which case there should be a big R-bus logo on the boiler sticker.OpenTherm Connections Polarity free Maximum line length 50 meters Maximum cable resistance 2.5 Ohms Plastic Thermoplastic, flame retardant Transmission distance Approx. 30m in open terrain Protection rating IP30 Dimensions 135mm(L) x 90mm(W) x 33mm(D) Complies with: EN60730-1 EN 60730-2.7, EMC Directive 2014/30/EU, LVD Directive 2014/35/EU, R&TTEAs featured in Installer Magazine's Webinar:"Everything Installers Need To Know About OpenTherm". https://www.installeronline.co.uk/webinar-everything-instal...Check out my new video https://www.youtube.com/watch?v=p77iH66vcUoBoiler Plus ,How to connect your Nest Thermostat Using OpenTherm. Ideal Vogue installation ...1. Check the thermostat power cable, plug and power socket. If you have a Google Nest Learning Thermostat on the Nest Stand: Make sure that the Nest power cable is fully inserted into the. power plug and that the plug has been pushed all the way into the. wall socket. Check that the wall socket is switched on.OK here is my set up: Viessmann 100 -W WB1C 19kw system boiler utilizing the 4 pipe system. Viessmann unvented cylinder connected to the boiler with the thermistor probe (no time control) underfloor floor heating connected to the boiler with weather compensation and opentherm (7 day programmer) Ok problems: 1. hot water will not …Opentherm connection (Optional) Inquire Now. Product Information; Technical Parameter; Dimension&Installation; FAQ; Our underfloor heating wiring centres have been designed to simplify the wiring process. Using our wiring centres in your application means that the actuator, boiler and pump connections are wired from a single point. HR-02 is ...The extension kit is compatible with the current V3/V3+ bridge and the previous V2 bridge. If you install the extension kit you don't need the wireless receiver. It's not permitted to have both devices in the same system. If you want a complete starter set the product code is V3P-SK-ST01EK01IB01-TC-UK.Le Thermostat Modulant Intelligent est compatible avec les chaudières OpenTherm. Pour déterminer si votre chaudière est compatible OpenTherm : Vérifier la présence d'un logo OpenTherm sur votre chaudière. Il peut être caché par un panneau amovible. Vérifier la présence de ports thermostat OpenTherm dans le manuel de votre chaudière.I have at last found an ecotechnician that is keen to work with me to provide an Opentherm solution with an Atag boiler. That said, I am struggling with a couple of things which are the costs/benefits of a £250 additional cost for an EBus to Opentherm converter and Opentherm bridge, and getting confirmation that the Atag Opentherm connection can cope with multiple HR92 zones?Opentherm connection (Optional) Inquire Now. Product Information; Technical Parameter; Dimension&Installation; FAQ; Our underfloor heating wiring centres have been designed to simplify the wiring process. Using our wiring centres in your application means that the actuator, boiler and pump connections are wired from a single point. HR-02 is ...Yes with the Tado wired thermostat or Tado wireless EU version (single channel relay with opentherm connection) very easy to install. Yeah most smart brands don't offer wireless temperature control on the hot water side but as people have said, you wouldn't need to change this if you set it above 55degrees all year.OpenTherm not only maintains the correct room temperature set point but also helps the boiler's efficiency by running at lower flow temperatures for longer periods. This ensures the boiler stays condensing for longer periods of time. 2. Increased boiler lifespan. Because boilers are kept in condensing ‘mode’ for longer periods, the impact ...We're having a new Ideal Vogue C32 boiler fitted today and tomorrow, it has 2 OpenTherm terminals, but they're not individually marked with OT1 and OT2 (please see photo). I'm thinking of fitting a Nest 3rd Gen Thermostat, the heatlink that is supplied with the Nest has OT1 and OT2 marked and the diagram shows to connect OT1 from the Heatlink ...Il protocollo OpenTherm® definisce il linguaggio di comunicazione, cioè il modo con cui vengono definiti i dati da rendere fruibili, e l’interfaccia, ovvero il mezzo attraverso il quale scambiare i dati (normalmente via cavo oppure a volte anche attraverso sistemi ad onde radio). Riprendendo l’esempio del collegamento tra termostato e ...OpenTherm is a language that compatible thermostats and heating systems can use to talk to each other, enabling thermostats to control heating and domestic hot water systems. The following Google...The Catholic Church has been a cornerstone of faith for millions of people around the world for centuries. In recent years, technology has allowed us to connect with our faith in n...OpenTherm boiler connection. In general to connect Master OpenTherm Shield you need 3 pairs of wires. First (GND, 3.3/5V) is for powering shield, depending on your microcontroller you can power up it with 3.3v or 5v. Second (IN,OUT) - for connecting microcontroller input, output pins. Third (B1,B2) - for boiler connection. Master OpenTherm Shield Viessmann OpenTherm Pdf User Manuals. View online or d6 April 2017, 09:13 PM. That makes more sense. I3.2 OpenTherm/Light (OT/-) 3.3 OpenTherm Smart Power.
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Hive is just an on/off 'stat. It does not have Opentherm connections. If you wanted to use it on your Vitodens, you would use these connections: N to N on Hive. L to L. Add a link wire between L and 1 on the Hive. And connection 'B' on the boiler would connect to 3 on the Hive.OpenTherm Library. OpenTherm Library for HVAC system control communication using Arduino and ESP8266/ESP32 hardware. OpenTherm Library is based on OpenTherm protocol specification v2.2 and works with all OpenTherm compatible boilers. Read the documentation.The opentherm connection is shown in figure-3 with code B. Year 6 (2022) Vol:21 Issued in MARCH, 2022 www.ejons.co.uk 315 fEJONS International Journal on Mathematic, Engineering and Natural Sciences ISSN 2602 - 4136 Figure - 3 : Viessmann Vitodens 100 - "B" Shows OpenTherm Connection [12] 2.6 Electronic Components of System This section ...Requires a Hive Hub to work. No OpenTherm connection. At just £59.99, the Hive Thermostat Mini is a super-cheap smart thermostat. It requires a Hive Hub, which can be bought at the time of ...Jul 29, 2020 ... Hereby my attempt to do just this, in the hope it might just help one person. Order of connection. Nefit boiler; Bosch EasyControl; OpenTherm ...10.3 OpenTherm BUS & ON / OFF connection (blue) This PCB will detect if an OpenTherm or an On / Off device is connected to the blue plug on the terminal block. An OpenTherm compatible device as well as a volt free on / off thermostat or programmable room thermostat can be used to switch on or off the heat demand to the boiler.OpenTherm Adapter is minimized version of Arduino Controller and its compatible with 5V and 3.3V controllers like ... ESP8266 and other similar controllers. OpenTherm protocol requires simple low voltage twowire connection to boiler, but voltage levels (7..15V) still much higher than Arduino/ESP8266 levels, which requires OpenTherm ...boxer01. Nov 15, 2022. #9. Brambles said: With Vaillant, you need to interface through the Vaillant VR33 module to Ebus for a "limited" Open Therm connection. It (VR33) is around £100, available in the UK, but is cheaper to purchase in Europe (circa Euro 60).Worcester Bosch OpenTherm has eluded us here at MyBoiler.com for a while. New information has surfaced showing that it is indeed possible to use OpenTherm with a range of Worcester Bosch boilers using an adaptor. The boilers that operate using the modern EMS protocol system can be used with this adaptor to allow OpenTherm Thermostats to control Worcester Bosch boilers and other EMS protocol ...New Boiler plus approved control Baxi 630 with Nest thermostat on opentherm. Today we are working in Bramley Leeds. I just thought I’d do you a short video on how to wire the Baxi 600 onto OpenTherm with a Nest. So, if you have a look on them connections there, your black and your grey, they’re in OT1 and OT2, and then, in the …OpenTherm se encarga de regular la temperatura del agua cuando está nuestra caldera encendida. Trabajan de un modo distinto al de las calderas convencionales que solo tienen la función de apagado / encendido. Por tanto solo reciben esa orden, van al 0% o al 100% de potencia. Eso quiero decir que cuando llega a la temperatura deseada esta se ...Requires a Hive Hub to work. No OpenTherm connection. At just £59.99, the Hive Thermostat Mini is a super-cheap smart thermostat. It requires a Hive Hub, which can be bought at the time of ...I have the Nest HeatLink connected to the boiler via OpenTherm. I need to move the HeatLink due to wireless connection problems with the thermostat. The Wikipedia page for OpenTherm states that I can use a cable up to 50m with 2x5 ohm resistance. Not sure how to translate that into a specific decision for a type of cable.The Honeywell R8810A1018 Wireless OpenTherm Bridge (R8810) is a replacement of the BDR91 Wireless Relay Box when using a Honeywell wireless thermostat or Honeywell controller (evohome or RF2 Pack 3) with a OpenTherm enabled boiler. The Honeywell Wireless OpenTherm Bridge wires directly to the OpenTherm connection on your OpenTherm compatible ...Apr 15, 2018 ... HOW TO WIRE , NEST LEARNING THERMOSTAT INSTALLATION Step by step guide How to install the nest thermostat via Opentherm and on / off connection ...OpenTherm not only maintains the correct room temperature set point but also helps the boiler's efficiency by running at lower flow temperatures for longer periods. This ensures the boiler stays condensing for longer periods of time. 2. Increased boiler lifespan. Because boilers are kept in condensing 'mode' for longer periods, the impact ...Just added Opentherm connections (combi-boiler). Do I need to reset the system to recognise the new Opentherm connections? Thermostat Hi All I just this afternoon installed a Nest 3rd gen. After a couple of hours of use, I additionally connected the OT1 and OT2 connections to the heat link (my combi-boiler supports OpenTherm). ... Use OpenTherm ...Opentherm connection3 Opentherm connection to the boiler is working correctly. 1 1 2 2 3 3 Battery replacement Batteries should operate for approximately 18 to 24 months. Only good quality alkaline batteries are to be used. If the batteries run out then central heating and hot water will continue to operateI thought Nest worked with either the relay contacts or Opentherm, but not both. Someone correct me if I am wrong. I assume you were not using Opentherm with your old boiler. How was the programmer and thermostats connected? Easiest to replace those connections, not convert from relay based to Opentherm.Nov 2, 2021. #1. Hi. I have a normal on/off thermostat connected to my Ideal Vogue Max 40 and have been looking through the installation manual ( here) to see how to connect an Opentherm stat. The instructions say "The link wire on the 230V installer room stat/timer connection gives a demand in conjunction with the OpenTherm link wire (located ...Pressure in the heating system. Gateway status (depending on errors and connection status) Boiler connection status via OpenTherm interface. The current temperature of the heat carrier (usually the return heat carrier) Set heat carrier temperature (depending on the selected mode) Current hot water temperature. Home Assistant integration via MQTT.Find Baxi system boiler and Opentherm Advice and Help. How-to Baxi system boiler and Opentherm in the Central Heating Forum advice boards on...The Wired Smart Thermostat Starter Kit V3+ allows a wired connection to a combi boiler through relay and digital control (Opentherm,...). View full details About the productArduino/ESP8266/ESP32 OpenTherm Library for HVAC system control communication - ihormelnyk/opentherm_library. ... OpenTherm protocol requires simple low voltage twowire connection to boiler, but voltage levels (7..15V) still much higher than Arduino/ESP8266 levels, ...This library provides implementation of OpenTherm protocol. OpenTherm Library is based on OpenTherm protocol specification v2.2 and works with all OpenTherm compatible boilers. Library can be easily installed into Arduino IDE and compiled for Arduino, ESP8266/ESP32 and other similar controllers.Page 5 OpenTherm connection OpenTherm connection OpenTherm connection Putting the Device into Operation Remove front cover of the transmitter and insert 2× 1.5 V AA alkaline batteries.mandark (Joris) August 26, 2022, 10:37am 7. Solution/workaround: If you have an opentherm gateway with NodeMCU and you were using the serial connection over a socket and having this problem: A workaround is to not use this integration at all and flash your NodeMCU with the firmware from here: GitHub.OpenTherm Adapter is minimized version of Arduino Controller and its compatible with 5V and 3.3V controllers like Arduino, ESP8266 or Raspberry Pi. OpenTherm Adapter allows you to control your boiler using your favorite controller via OpenTherm protocol which is implemented in OpenTherm Library.It is good for making your custom thermostat or for boiler remote control.CP4i Smart Thermostat provides the ultimate convenience in heating control. Take command of your home's temperature effortlessly, whether you're within arm's reach or miles away. With its one-click boost function, you can decide the duration and desired temperature instantly. Elevate your comfort and enhance energy efficiency with the reliable smart heating control from EPH.The opentherm_gw integration is used to controlOpenTherm se encarga de regular la temperatura del agua cu
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This component provides support for opentherm devices such as: DIYLess' Master OpenTherm Shield; Ihor Melnyk' OpenTherm adapter; Those are typically connected to an ESP8266 or ESP32. The functional aspect (OpenTherm communications) is heavily based on ihormelnyk/opentherm_library.. The goal of this component is not to provide a …I have learnt the Viessmann Vitodens 100-W and 111-W do support an OpenTherm connection with Tado, Worcester Bosch Greenstar Style 8000 and Viessmann Vitodens 200-W do not. ... This is different to OpenTherm (which Tado also supports) as WB don't support this in the UK, where it hasn't been forced by legislation to be on every boiler. Reply replyCopy the secret and save it somewhere. 3. Find Your HEATHUB IP. Using your router, or something else, identify the IP address of your HeatHub, it usually identifies itself as the same ID as the WiserHeatXXXXXX. Alternatively see the test_api_discovery.py file for how to use the api to discover your hub.A library to interface with the OpenTherm Gateway through serial or network connection. thermostat hacktoberfest boiler opentherm opentherm-gateway thermostat-controller Updated Apr 28, 2024; Python; ... Opentherm is an gateway protocol used by several modern heating systems like Remeha. opentherm-gateway opentherm-monitor Updated Mar 6, 2023;FuboTV is a streaming service that offers live sports, news, and entertainment. It’s a great way to watch your favorite teams and shows without having to pay for cable. But how do ...OpenTherm connections in boiler Important - To avoid damage to Boiler and Thermostat, con - nect only to OpenTherm connections on boiler, do not connect to any other power source. ORT-01 ORT-10 There are some new words entering the HVAC vocabulary, OpenTherm and modulating controls. OpenTherm is an Industry Standard for Modulating controls.OpenTherm is a point-to-point communication system and connects gas central heating (condensing) boilers with room thermostats. The OpenTherm 'protocol' sets the rules on how the boiler and the room thermostat communicate with each other. When installed, an OpenTherm compatible boiler (such as an Intergas Xclusive 30) using OpenTherm compatible ...OpenTherm is a digital language that puts the boiler and thermostat in constant communication. This gives the boiler more information about the temperature of the room, which it can use to run more efficiently. Most modern condensing boilers are modulating. This means they can run at more than one heating output (the output, otherwise known as ...the OpenTherm connection 4. The device will prompt set up of the time and date using an easy step by step process. 5. There is the opportunity to add an installer contact phone number into the device at this stage, if not changed this will default to the Ideal Boilers Customer Service number. F. HALO LITE FEATURES AND CONFIGURATIONIf your boiler supports OpenTherm please follow these instructions: Remove the OpenTherm cables from the existing controller or thermostat. Connect the cables to the OpenTherm terminals ... Energy Class V = 3% using OpenTherm connection Relevant EC Directives: 2014/53/EU (RED) 2011/65/EU (RoHS) 2012/19/EU (WEEE) Standards: EN 60730-1 EN 60730-2 ...I think you may have a set up issue with the open therm settings, call nest, they can see your settings from their end and can adjust them. Thanks Ian, correct, it is an Opentherm connection (Live, Neutral, OT1 and OT2). My Boiler is Baxi 630 Combi, which is Opentherm compatible. I did call Nest, but they want me to get a Nest Pro out, huge £ ...Learn about the OpenTherm protocol and interface specifications for modulating HVAC appliances and room thermostats.The neoHub Mini has an OpenTherm output to connect to a compatible OpenTherm boiler. Check with your boiler manufacturer to verify if your boiler is OpenTherm compatible. The OpenTherm connection to the boiler must be wired in shielded cable. Pairing the neoAir V2 to the neoHub Mini. On the neoHub Mini..Opentherm connection between the Boiler and Transceiver; What does it mean if it shows a Zone 1 fault on my Touch Connect thermostat? + A 'Zone 1 Fault' means that the boiler and Touch Thermostat have lost RF (Wireless) connection. Please see the location guidelines in the Touch Connect User Guide. Or if the gateway is off.Basic wiring and coding to start up the B1HA & B1KA boilers Link 1 (computer)https://www.viessmann-us.com/content/dam/vi-brands/CA/pdfs/doc/b1ha/vitodens_100...Oct 28, 2016 · I have at last found an ecotechnician that is keen to work with me to provide an Opentherm solution with an Atag boiler. That said, I am struggling with a couple of things which are the costs/benefits of a £250 additional cost for an EBus to Opentherm converter and Opentherm bridge, and getting confirmation that the Atag Opentherm connection can cope with multiple HR92 zones?The old boiler didn't have modulation. I've had the tado system for around 4 years now so have the below setup: extension kit which is wired directly into boiler. internet bridge. 6 wireless radiator thermostats. 5 wireless add-on room thermostats. I've attached a screenshot of how my current extension kit has been wired into the boiler.Installer menu - OpenTherm PO 6 Setting DHW temperature 38 39 PO 8 DHOP 40 40 43 PO 9 Set OpenTherm® parameters Controlling an OpenTherm Boiler with multiple CombiPack 4-OT 42 46 50 52 ... Important: Do not connect Mains Voltage to OpenTherm® terminals. 14 RF1A-OT Wireless Receiver CP4 1) ...In deze video laten we u zien hoe u de R8810 OpenTherm ketelmodule kunt toewijzen aan evohome Wi-Fi. Doe dit alleen in situaties waarin geen aan/uit zoneklep...Nefit Moduline Easy Connect adapter for OpenTherm devices. Nefit Easy Connect. Description: This adaptor allows the Worcester Wave or Nefit equivalent to connect to …I have a wired thermostat connected to an Ideal Combi Logic+ 24 on the relay interface and all is working fine. I am not able to make it work using the OpenTherm Interface. Moving the wires as in pictures and following the instructions to set up the OpenTherm interface (D01/HW on etc) doesn't work, the boiler is always ON. Interestingly the ...OpenTherm integration is based on OpenTherm protocol specification v2.2 and works with all OpenTherm compatible boilers. OpenTherm protocol requires a simple low voltage two-wire connection to the boiler, but voltage levels (7..15V) still much higher than ESP8266 levels, which requires OpenTherm Adapter. Les chaudières OpenTherm permettent un contrôle par m