Komfovent · HVAC controller
C6 / C6M controller for Komfovent air handling units Modbus register map
Default configuration
- Protocol
- Modbus TCP
- Port
- 502
- Unit ID
- 1
- Addressing
- 1-based
- Byte order
- Big endian
- Word order
- High word first
Register map
| Address | Count | Name | Type | Unit | Scale | Access |
|---|---|---|---|---|---|---|
| 1 | 1 | ON/OFF status 0 = off, 1 = on. | UInt16 | - | 1 | RW |
| 2 | 1 | Auto mode control 0 = scheduling, 1 = air quality. | UInt16 | - | 1 | R |
| 3 | 1 | ECO mode 0 = off, 1 = on. | UInt16 | - | 1 | RW |
| 4 | 1 | AUTO mode 0 = off, 1 = on. | UInt16 | - | 1 | RW |
| 5 | 1 | Current mode Read: 0 = standby, 1 = away, 2 = normal, 3 = intensive, 4 = boost, 5 = kitchen, 6 = fireplace, 7 = override, 8 = holiday, 9 = air quality, 10 = off. Write: away = 1, normal = 2, intensive = 3, boost = 4. | UInt16 | - | 1 | RW |
| 6 | 1 | Scheduler operation mode 0 = stay at home, 1 = working week, 2 = office, 3 = custom. | UInt16 | - | 1 | RW |
| 7 | 1 | Next mode 0 = standby, 1 = away, 2 = normal, 3 = intensive, 4 = boost, 5 = kitchen, 6 = fireplace, 7 = override, 8 = holiday. | UInt16 | - | 1 | R |
| 8 | 1 | Next mode start time Minutes from midnight, 0..1439. | UInt16 | min | 1 | R |
| 9 | 1 | Next mode weekday 0 = none, 1 = Monday .. 7 = Sunday. | UInt16 | - | 1 | R |
| 10 | 1 | Mode mask before the next change Bit mask: standby = bit 0, away = bit 1, normal = bit 2, intensive = bit 3, boost = bit 4. | UInt16 | - | 1 | R |
| 11 | 1 | Temperature control mode 0 = supply, 1 = extract, 2 = balance, 3 = room. | UInt16 | - | 1 | RW |
| 12 | 1 | Flow control mode 0 = CAV, 1 = VAV, 2 = DCV, 3 = off. | UInt16 | - | 1 | RW |
| 13 | 2 | Maximum supply flow Maximum supply airflow of the unit. | UInt32 | m³/h | 1 | R |
| 15 | 2 | Maximum extract flow Maximum extract airflow of the unit. | UInt32 | m³/h | 1 | R |
| 17 | 1 | Max supply pressure Maximum duct pressure setpoint of the supply fan. | UInt16 | Pa | 1 | RW |
| 18 | 1 | Max extract pressure Maximum duct pressure setpoint of the extract fan. | UInt16 | Pa | 1 | RW |
| 39 | 1 | Room sensor 0 = panel temperature (1), 1 = panel temperature (2). | UInt16 | - | 1 | RW |
| 200 | 1 | Minimum supply air temperature Lower limit of the supply air temperature control (x10 °C). | UInt16 | °C | 0.1 | RW |
| 201 | 1 | Maximum supply air temperature Upper limit of the supply air temperature control (x10 °C). | UInt16 | °C | 0.1 | RW |
| 203 | 1 | Heating enable denied 0 = off, 1 = heating is not allowed. | UInt16 | - | 1 | RW |
| 204 | 1 | Cooling enable denied 0 = off, 1 = cooling is not allowed. | UInt16 | - | 1 | RW |
| 206 | 1 | Temperature setpoint Supply air temperature setpoint (x10 °C, e.g. 220 = 22.0 °C). | Int16 | °C | 0.1 | RW |
| 207 | 1 | Air quality setpoint CO2 setpoint in ppm. | UInt16 | ppm | 1 | RW |
| 208 | 1 | Humidity setpoint Relative humidity setpoint, 0..100 %. | UInt16 | % | 1 | RW |
| 211 | 1 | Air quality heating 0 = off, 1 = on. | UInt16 | - | 1 | RW |
| 212 | 1 | Air quality check period 1..24 hours. | UInt16 | h | 1 | RW |
| 213 | 1 | Air quality sensor type B8 0 = none, 1 = VOC, 2 = CO2, 3 = RH. | UInt16 | - | 1 | RW |
| 214 | 1 | Air quality sensor type B9 0 = none, 1 = VOC, 2 = CO2, 3 = RH. | UInt16 | - | 1 | RW |
| 217 | 1 | Heat recovery control 0 = none, 1 = maximum, 2 = not stop. | UInt16 | - | 1 | RW |
| 901 | 1 | Heating/cooling configuration Bit mask: electric heater = bit 0, water cooler/heater = bit 1, DX unit = bit 2. | UInt16 | - | 1 | R |
| 902 | 1 | Supply temperature (actual) Supply air temperature (x10 °C). | Int16 | °C | 0.1 | R |
| 903 | 1 | Extract temperature (actual) Extract air temperature (x10 °C). | Int16 | °C | 0.1 | R |
| 904 | 1 | Outdoor temperature (actual) Outdoor air temperature (x10 °C). | Int16 | °C | 0.1 | R |
| 905 | 1 | Water temperature (actual) Return water temperature of the water heater/cooler (x10 °C). | Int16 | °C | 0.1 | R |
| 906 | 2 | Current supply flow Supply airflow measured by the unit. | UInt32 | m³/h | 1 | R |
| 908 | 2 | Current extract flow Extract airflow measured by the unit. | UInt32 | m³/h | 1 | R |
| 910 | 1 | Current supply fan intensity Supply fan output (x10 %). | UInt16 | % | 0.1 | R |
| 911 | 1 | Current extract fan intensity Extract fan output (x10 %). | UInt16 | % | 0.1 | R |
| 912 | 1 | Heat exchanger level Rotary/plate exchanger output (x10 %). | UInt16 | % | 0.1 | R |
| 913 | 1 | Electric heater level Electric heater output (x10 %). | UInt16 | % | 0.1 | R |
| 914 | 1 | Water heater level Water heater output (x10 %). | UInt16 | % | 0.1 | R |
| 915 | 1 | Water cooler level Water cooler output (x10 %). | UInt16 | % | 0.1 | R |
| 916 | 1 | DX unit level DX (direct expansion) unit output (x10 %). | Int16 | % | 0.1 | R |
| 917 | 1 | Filters impurity Filter contamination level in percent. | UInt16 | % | 1 | R |
| 918 | 1 | Air dampers Damper position in percent. | UInt16 | % | 1 | R |
| 919 | 1 | Supply pressure Measured supply duct pressure. | UInt16 | Pa | 1 | R |
| 920 | 1 | Extract pressure Measured extract duct pressure. | UInt16 | Pa | 1 | R |
| 921 | 1 | Power consumption Electrical power drawn by the air handling unit. | UInt16 | W | 1 | R |
| 922 | 1 | Heater power Power drawn by the heater. | UInt16 | W | 1 | R |
| 923 | 1 | Heat exchanger recovery Heat recovered by the exchanger. | UInt16 | W | 1 | R |
| 924 | 1 | Heat exchanger efficiency Recovery efficiency of the heat exchanger. | UInt16 | % | 1 | R |
| 925 | 1 | Energy saving Energy saving compared with a reference solution. | UInt16 | % | 1 | R |
| 926 | 1 | SPI Specific power input of the unit. | UInt16 | W/(m³/h) | 1 | R |
| 927 | 2 | AHU consumption, day Electrical energy used by the unit today. | UInt32 | Wh | 1 | R |
| 929 | 2 | AHU consumption, month Electrical energy used by the unit this month. | UInt32 | Wh | 1 | R |
| 931 | 2 | AHU consumption, total Electrical energy used by the unit since commissioning. | UInt32 | Wh | 1 | R |
| 939 | 2 | Recovered energy, day Heat recovered today. | UInt32 | Wh | 1 | R |
| 941 | 2 | Recovered energy, month Heat recovered this month. | UInt32 | Wh | 1 | R |
| 943 | 2 | Recovered energy, total Heat recovered since commissioning. | UInt32 | Wh | 1 | R |
| 952 | 1 | Air quality sensor 1 (B8) CO2 in ppm or RH in percent, depending on the sensor type set in register 213. | UInt16 | ppm | 1 | R |
| 953 | 1 | Air quality sensor 2 (B9) CO2 in ppm or RH in percent, depending on the sensor type set in register 214. | UInt16 | ppm | 1 | R |
| 961 | 1 | Exhaust temperature Exhaust air temperature (x10 °C). | Int16 | °C | 0.1 | R |
| 962 | 1 | Extract humidity Relative humidity of the extract air; -32768 = humidity sensor not configured. | Int16 | % | 1 | R |
| 1000 | 2 | Firmware version Packed version: 1st number 8 bits << 24, 2nd 8 bits << 16, 3rd 8 bits << 12, 4th 12 bits (e.g. 18886660 = 1.2.3.4). | UInt32 | - | 1 | R |
| 1050 | 1 | Reset settings Reset to the stored values: away = 1, normal = 2, intensive = 3, boost = 4, holidays = 5, override = 6, kitchen = 7. | UInt16 | - | 1 | RW |
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Related guides
Notes
Source: UAB Komfovent 'Description of C6 / C6M controller Modbus', document M-C6 / C6M_26-07, compatible with C6/C6M firmware X.X.X.18 and newer: section 3 'Communication' (Modbus TCP on the controller's own Ethernet port, default address 192.168.0.60, port 502; Modbus RTU defaults 19200 bps, 8 data bits, even parity, 1 stop bit) and Table 3 'Modbus registers' (pages 7-31). The controller speaks Modbus TCP itself, so no gateway is needed; this file uses the TCP port and leaves the RS-485 defaults only in the note. Table 3 numbers the registers from 1 and that is how this file addresses them (declared one-based), which is also how the public Home Assistant configuration for the C6 (borpin/ha_komfovent_config) addresses them: its 'on/off' switch sits at address 0 for register 1, the ECO switch at 2 for register 3 and the current mode at 4 for register 5. The manual documents that the RTU protocol ID and the interface settings can be changed under SETTINGS > CONNECTIVITY but does not print a factory value for the ID, so unit 1 is used here and must be matched on site if the controller was given another ID. Data types follow the manual's own column: 'unsigned char' is a 16-bit register holding an 8-bit value, 'unsigned short' one register, 'unsigned int' two registers. The 900-series measurement rows are marked 'RO' in the manual and the 1-18/200-217/1050 rows 'R/W' or 'RO' as noted; every scale factor comes from the 'x10' entries in the Values and Units column (x10 C = 0.1, x10 % = 0.1). The weekly-schedule, alarm-log and panel blocks are left out: they are long repeated blocks (registers 300-343, 727-801, 946-951) whose meaning depends on the schedule slots, and the alarm rows are packed date/time words, none of which add a reading to this map.