The RC20 room controller may only be used to operate and control. Buderus heating systems in houses and flats. The boiler must be equipped with EMS. Buderus. Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic . Buderus. Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic; Logamatic.

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Understanding the EMS Bus of Buderus / Nefit boilers – Domotic Project

Maybe with message 0x02 sofware version you can also infer the thermostat type. After some try and error, I have found that, for the RC35 Room Controller, values 39 and 7 for activation and deactivation work better. The EMS bus supplies a voltage of 12 volts to power the controllers. There is no way to set this value with a write command or at least I have not been able to achieve this rc220rf far.

This is a status message containing some general information about the working conditions of the system. Mapping out sidewall ventilation before installation is crucial to prevent this. This message type contains the system date and time stored in the room controller RC Luckily, Buderus boilers use a partially-documented protocol to communicate the controllers with the heating modules.

The DHW Once functionality should be, theoretically, activated by means of this data package. Once this write command is sent, if the operation is successfully processed by the destination device, it will send an acknowledge message containing only one byte: So, to know the time configured in the system you should send a read command poll first.

The bus master then will repeat every byte sent on the bus as an echo. A datagram with n Bytes send through the EMS bus follows this structure:. Ohming out the wires back to the 81 pin connector behind the UBA will determine if the wiring harness or the fan itself needs to be replaced.


Follow these steps when experiencing a 6A error code:. The EMS bus is usually accessible though a 3,5 mm service jack located in the front panel of the boiler. I have divided this tutorial in three parts. To know if your installation is compatible with this tutorial, look at your room controller.

To modify the values, use the Working Mode datagrams. However, I have noticed that sometimes this values are directly ignored despite receiving an acknowledge datagram from the bus master. The ionization rod can be one of many problems causing the boiler not to fire.

For this reason I started to search for ways to control the boiler remotely. Note that if not otherwise indicated, all the values are transmitted using big endian order the most significant bytes are located at the lowest storage address.

Another very good source of information are the microcontroller forumsspecially these topics: Besides the default programs already defined in the controller, the user can create and edit two fully configurable programs with 42 switching points each per Heating Circuit.

To change this value, just send this write command:. This data package contains status information about the Heating Circuit 1 HC1. It is only sent upon demand. In case the web is not available, I have exported it as a PDF. This status message contains specific information about the system. This datagram contains the system total operating minutes.

Buderus RC Set RC20RF RFM20 V10 Verp 6-304-334-6 63043346

Detailed venting information can be found in section 6. As commented previously, the offset references a specific position in rc02rf datagram payload.

All the existing addresses are queried once in a while by the bus master. This package type contains configuration options regarding the working mode of the DHW system.


It can be useful to modify one of the parameters of this last datagram. A 3C error code refers to a bad connection to the fan or a faulty fan. This is a “no ionization after ignition trial” message. However, it can also be requested. Information travels at bauds and is coded using an 8N1 configurationwhich means eight 8 data bits, no N parity bit, and one 1 stop bit.

A minimum of 3 feet from an inside or outside corner and at least 5 feet below an overhang is necessary so that the fresh air intake does not draw in particulates from the nearby exhaust that will foul sensors within the boiler, causing it to shut down.

The boiler controller MC10 Basic Controller will send it periodically. Apart from the jack, you will also find an EMS bus connection in the inside interface of the boiler.

In my case, the jack plug was protected under a tap in the BC You may also find it in products from Nefit, a company of the same group. Venting should not be installed into an alcove where air currents can sometimes keep exhaust hanging in the area to be sucked back in. I have focused my work on the most interesting parameters to be showed and controlled in a domotic system.

To ask for this information, the arduino should send the following read command datagram:. When the value is 3, the function is stopped. For instance, when leaving the house for holidays, you can switch the DHW working mode to off.