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DomBus34 is a DIN-RAIL module, 54mm wide, designed to interface up to 4 power/energy meters, type DDS 238-2 ZN/S (Modbus), to measure power and energy (both imported and exported), voltage frequency and power factor.
It implements 2 relay outputs 250V 5A SPST with overvoltage protection, 1 AC input 110-240Vac, and 2 low-voltage inputs that can be connected to pushbuttons and switches, double pushbuttons and counters.
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DomBus34 is a DIN-RAIL module, 54mm wide, designed to interface up to 4 power/energy meters, type DDS 238-2 ZN/S (Modbus), to measure power and energy (both imported and exported), voltage frequency and power factor.
It implements 2 relay outputs 250V 5A SPST with overvoltage protection, 1 AC input 110-240Vac, and 2 low-voltage inputs that can be connected to pushbuttons and switches, double pushbuttons and counters.
It's designed to activate loads based on power availability, for example when photovoltaic or wind system is producing, and to display nice charts with statistics about energy production/usage with comparisons in a year-by-year basis.
Load switching can be achieved using DCMD commands, but as it works with Domoticz home automation system, it's also easy to make visual and text scripts to do even complex automations.
As other DomBus modules, all ports can be configured in many different ways, and also this module supports DCMD, commands sent to the same or other modules to perform simple actions, that permit to achieve high reliability (DCMD commands work even if domotic controller is not operational) and easy programming (don't need to create automations in the domotic controller, just configure DomBus ports to perform actions on events). Last, but not least, as other DomBus modules, it's optimized to get low power consumption, less than 10mW normally (0.75mA @13.6V) and less than 150mW when all relays are ON (10mA @13.6V).
DDS238-2 ZN/S energy meters are factory programmed with Modbus address = 1. Everytime a new energy meter is connected to the Modbus, its default address should be changed as 2, 3, 4 or 5, by selecting the device M1 Addr and writing in the device Description ADDR=2 , for example: in this way the energy meter with Modbus addr=1 will be programmed with the new selected address.
Anytime a new energy meter is added, a new set of device will be enabled, displaying the current import and export power/energy, voltage, power factor and frequency.
*Please check the page in English to get the correct values of commands!
While it's possible to do any automations using the domotic controller features, essential automations can be performed using the DCMD commands that are executed directly by the DomBus module. DCMD commands should be specified in the device description, work even in case that domotic controller is offline and can be sent to the same module itself or to other DomBus modules connected to the same bus.
The syntax is DCMD(Event:ValueLow:ValueHigh)=ModuleAddress.ModulePort:Command:Value
where ValueLow, ValueHigh, Value are optional parameters.
Event | Description | Example |
OFF | This even occurs when input (IO1, IO2 or INAC) goes OFF |
DCMD(OFF)=3401.1:OFF When input goes off, turns OFF also port 1 of module 3401 DCMD(OFF)=3102.1:OFF When input goes off, turns OFF also port 1 of module 3102 |
ON | This even occurs when input (IO1, IO2 or INAC) goes ON |
DCMD(ON)=3401.1:ON:90s When input goes on, turns ON port 1 of module 3401 for 90s DCMD(ON)=3102.1:ON When input goes on, turns ON port 1 of module 3102 |
PULSE | Input is pulsed ON for less than 0.5s | DCMD(Pulse)=13.3:TOGGLE When input is pulsed shortly, send command to module 13 port 3 to toggle it's output OFF->ON or vice versa |
PULSE1 | Input is pulsed ON for about 1s |
DCMD(Pulse1)=13.3:ON |
PULSE2 | Input is pulsed ON for about 2s |
DCMD(Pulse2)=13.3:OFF |
PULSE4 | Input is pulsed ON for about 4s |
DCMD(Pulse4)=13.4:ON:2h |
VALUE | Sensor value is ≥ ValueLow and < ValueHigh Command is repeated every 30s if the comparison matches. |
DCMD(Value:0:100)=31.8:OFF DCMD(Value:0:248)=34.2:OFF |
A possible application of DCMD commands is to enable a load when there is enough exported energy (from solar photovoltaic), and disable it when solar production disappears, or disconnect a photovoltaic string when inverter AC output is too high, and enable it when AC output is normal.
Assuming that the DomBus34 module has address 3401, selecting the Grid Import Energy device and writing in the description field
DCMD(Value:1800:65000)=3401.1:ON
it's possible to configure the device to automatically enable relay1 when the export power is greater or equal to 1800W (for example to activate a boiler or another load).
Writing the following command on the Grid Import Energy
DCMD(Value:500:65000)=3401.1:OFF,
the DomBus34 module will be configured to disable relay1 when the imported power is greater than 500W. This behaviour is managed internally by the DomBus34 module, and domotic controller will be informed about the state of the Relay1 output.
Similarly, writing the following commands to the the Grid Voltage device
DCMD(Value:252:280)=3401.2:ON, DCMD(Value:0:248)=3401.2:OFF
it's possible to activate relay2 output when the voltage raises to 252V or above, disabling relay2 when voltage falls below 248V: this can be useful during the Summer to avoid inverter disconnections (overvoltage protection) by enabling a load or disconneting a photovoltaic string.
If the output to enable/disable is in another DomBus module, just specify it's address (e.g. 0001.8) and that output will be enabled/disabled based on the current power or voltage value.
Modbus address | Modbus value | DomBus parameter | Function |
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8192 | 1-247 | HWADDR=0xNNNN | This command sets a new address for the DomBus module. Be sure to assign to each module a unique address, to avoid conflicting modules. DomBus protocol and Domoticz: choose a device associated to the module, edit and add in the description field the text ,HWADDR=0x0001 for example, to assign address 1 to the module. Reload the Switches panel to see the new devices associated to the new module address. NNNN must be a number in exadecimal format, from 0x0001 to 0xff00, so 65280 combinations are available. Keep note of address assegnated to each dombus device, because in case of conflicting addresses it's needed to switch off one of the conflicting device and program the remaining one to another address, or make a factory reset as explained below. |
8193 | 0-7 | Not available | Set the serial bitrate to: 0 → 115200 bps (default) 1 → 57600 bps 2 → 38400 bps 3 → 19200 bps 4 → 9600 bps 5 → 4800 bps 6 → 2400 bps 7 → 1200 bps |
8194 | 0-2 | Not available | Set the serial parity to: 0 → none (default) 1 → even 2 → odd |
INVERTED | Used to invert the logic state of an input or output. Can be used in conjuction with OUT_DIGITAL, OUT_RELAY_LP, IN_DIGITAL, DIMMER. Normally, domoticz switch is On if input is at logic level high (open), and Off when it's shorted to ground. If INVERTED is specified, domoticz switch will be On when the corresponding input is shorted to ground, and vice versa. |
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OUT_DIGITAL | Output, open collector, active low, On → output wire is shorted to GND (max current 50mA). Off ⇒ output is open (current=0). | ||
OUT_RELAY_LP | Not recommended: output, open collector, active low, but with duty cycle 25% to reduce power consumption on relays coil | ||
OUT_DIMMER | Set the output as DIMMER, from 0 to 100% using 5% step, 500Hz frequency. Suitable to control LED strip lights | ||
OUT_BUZZER | Set two outputs as BUZZER: a piezo buzzer can be connected to the selected two ports (configured in push-pull) to generate 5KHz frequency when the corrsponding Domoticz switch is On. The Domoticz switch can be configured as selector: in this case buzzer will output 1 or more short alerts to notify a status, similarly to the led configured as OUT_DIGITAL with Domoticz switch configured as Selector. | ||
OUT_BLIND |
Port configured to control a blind, in close direction. Next port will be automatically configured as blind in open direction. | ||
OUT_LEDSTATUS | Configure a LED port to show the device status (flashes when a frame is transmit to the RS485 bus) | ||
OUT_ANALOG | Set output as analog, with 0-10V linear output. It can be used to control another electronic board with 0-10V or 1-10V input (light dimmer, heat pump power, linear valve, ....). The domotic controller will display a device with a slider, like dimmer, with values from 0 (=0V) to 100 (=10V). Using Domoticz, it's possible to create LUA or dzEvent automations that automatically change the output voltage according to some inputs (brightness, temperature, renewable power availability, ...): the DAC value can be set using the syntax commandArray['DEVICE_NAME']='Set Level 74'
to set the output voltage to 7.4V.
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IN_DIGITAL | Digital input, is On when the corresponding input is at high voltage level (open), and Off when the corresponding input is at GND (shorted). | ||
IN_ANALOG | Port configured as IN_ANALOG can be used to measure DC voltage, like battery voltage, bus voltage, thermistors and temperature sensors, .... The voltage is sampled every 15 seconds. DomBusTH has one pad/hole where it's possible to solder a wire to measure an external DC voltage, <30Vdc; a solder jumper must be opened (because that pad is connected to Vbus). Also, one or more of the 4 input wires can be configured as analog inputs, 0-3V range: a solder jumper in the PCB must be opened (by cutter) to disable the internal pullup resistor. Also, external resistive divider should be added to measure higher voltages, so the voltage at the input terminal block must be less or equal than 3V. On DomBus12 it's possible to use IO7, IO8 and IO9 ports as analog inputs. Also, it's possible to use IO1, IO2, IO3, IO4 ports as analog inputs, but in this case it's needed to open, using a cutter, the corresponding PCB jumper PU1-PU4 (that internally connect the input line with a 10k pullup resistor): for example, to use IO1 as analog input, the PU1 PCB jumper must be open. Analog voltage must not exceed the 0-3V range: if voltage range is higher, a resistive divider must be applied externally. On DomBus23 only IO1 and IO2 ports can be configured as analog inputs: only 0-3V range is supported, and a resistive divider must be externally connected to measure higher voltages. |
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IN_COUNTER | Used to count pulses, max 16 pulses/second (57kW max using 1000pulses/kWh meter, or 28kW max using 2000pulses/kWh meter). This solution is perfect to count energy, gas, water, ...If TYPENAME=kWh is also specified in Description, a device with both energy and power will be created. Other options that can be set for this kind of device is OPPOSITE=dev to set the device counting energy in the opposite direction (import vs export), and DIVIDER=nnnn where nnnn is the number of pulses/kWh (default 1000, but can be 1666, 2000 or any reasonable value). | ||
IN_TWINBUTTON | This is a method to connect two pushbuttons/switches to a single input, to get a UP/DOWN/STOP select switch. The two switches are connected together by a 4.7KOhm resistor, using the schema indicated in the application notes below. | ||
A | For analog and distance sensors: used to compute the real value using the formula REAL_VALUE=A * VALUE_FROM_DOMBUS + B. | ||
B | For analog and distance sensors: used to compute the real value using the formula REAL_VALUE=A * VALUE_FROM_DOMBUS + B For temperature, used to calibrate the value using the formula REAL_TEMPERATURE=MEASURED_TEMPERATURE + B |
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FUNCTION | For analog input with internal 10k pullup (I/Os that can be configured as IN_TWINBUTTON) connected to a NTC thermistor, to convert the read analog value to a temperature. Supported types: FUNCTION=3950 for NTC with Bcoeff=3950 Example: IN_ANALOG,FUNCTION=3950,B=-0.3 to use 3950 type NTC 10k@25°C, and calibrate offset -0.3°C. First configure device as IN_ANALOG and then as IN_ANALOG,FUNCTION=3950 As FUNCTION parameter enable a conversion performed by the domotic controller (not inside the DomBus module), DCMD(Value:min:max) command can be added but min and max value should be the analog values in the range 0 (corresponding to input at 0V) and 65535 (corresponding to 3.3V) |
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DIVIDER | Used with IN_COUNTER ports to set how many pulses per unit of measure. For example, using energy meter with 2000 pulses/kWh, the option DIVIDER=2000 should be set; in case of water meter with 20000 pulses/m³, DIVIDER=20000 should be set. | ||
TYPENAME | Option to force the creation of a the specified Domoticz. For example, IN_COUNTER,TYPENAME=kWh to create a energy/power meter instead of a normal incremental counter, or IN_ANALOG,TYPENAME=Temperature,A=0.123,B=-50 to get an analog input that return a temperature using the linear equation Temperature=A*x+B where x is the analog value read | ||
OPPOSITE | Used for kWh devices, measuring electric power and energy. Suppose to have a PowerMeter Import device, with Unit=98 (see Setup → Devices), measuring the power/energy from grid, and PowerMeter Export, with Unit=99, measuring the power/energy produced and fed to the grid. If these devices are connected to the pulse output of an energy meter, when a pulse is received from the Import device it means that exported power is 0, and vice-versa. This parameter is used to set what is the Unit number associated to the opposite counter. So, PowerMeter Import description must have IN_COUNTER,TYPENAME=kWh,OPPOSITE=99 and PowerMeter Export description IN_COUNTER,TYPENAME=kWh,OPPOSITE=98 |
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ADDR | EVSE: used to set the Modbus address of a DDS238-2 ZN/S energy meter. By default DDS238 has address=1 and baud rate 9600. Setting ADDR=2 to set the Modbus to the specified value. On DomBusEVSE module, address 2 is used to measure charging power/energy, and address 3 to measure grid power/energy. Valid range from 2 to 5. This parameter can be set only for the energy meter devices or M1 Addr device |
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EVMAXCURRENT | EVSE: set the max charging current, that normally is limited by the cable used to connect the vehicle to the charging station. Valid range from 6 to 36, default value is 16 Ampere. This parameter can be set only for the device named EV Mode |
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EVMAXPOWER | EVSE: maximum power that can be drained from the grid without any time limit (available power). Valid range from 1000 to 25000, default value 3300 Watt. This parameter can be set only for the device named EV Mode |
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EVMAXPOWER2 | EVSE: the highest power that can be drained from the grid, but only for a limited time. Valid range from 1000 to 25000, default value 0 (disabled). This parameter can be set only for the device named EV Mode |
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EVMAXPOWERTIME | EVSE: time in second to charge the electric vehicle using EVMAXPOWER Watt from grid, before increasing power to EVMAXPOWER2. Valid range from 60 to 43200 seconds, default value 0 (disabled). This parameter can be set only for the device named EV Mode |
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EVMAXPOWERTIME2 | EVSE: time in second to charge the electric vehicle using EVMAXPOWER2 Watt from grid, before decreasing power to EVMAXPOWER. Valid range from 60 to 43200 seconds, default value 0 (disabled). This parameter can be set only for the device named EV Mode |
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EVSTARTPOWER | EVSE: minimum available power to start charging: the minimum current is 6A, but usually the On-Board Charger charges less current than what is set, so maybe 900W is sufficient. Please note that charging at a low current lead to a poor efficiency (e.g. 30% power loss). Valid range above 800, default value 1200 Watt. This parameter can be set only for the device named EV Mode |
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EVSTOPTIME | EVSE: time in seconds after which the charging process is stopped if the available power is less than what is drained by the car with the minimum current (6A). This parameter is used to prevent that, expecially in SOLAR mode, the charging is ended if no power is available for a short time. Valid range from 5 to 600, default is 90 seconds. Time is internally reduced /5 in case that imported power from grid exceed the MAXPOWER parameter, to prevent disconnections. This parameter can be set only for the device named EV Mode |
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EVAUTOSTART | EVSE: can be set to 0 or 1. 0 means that this function is disabled. 1 means that this function is enabled, and permit to restart automatically the last charging mode when the vehicle is plugged again to the wallbox. Default value is 1. This parameter can be set only for the device named EV Mode |
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DISABLE | Used to disable one or more ports: it can be usedful with large buses with more than 255 ports (devices), because Domoticz has a limit of max 255 devices for each bus. In this case it's possible to disable unused module ports by writing, in the Description of port 1, the list of disabled ports separated by colon, for example DISABLE=2:5:6:7:11 to disable ports 2,5,6,7,11:16 (11 corresponds with port .b in hex and 16 with port .10 in hex) of the current module. Port 1 can be never disabled. To enable a previosly disabled port, just edit the port 1 description for that module, removing the port from the list of DISABLE command: that port will be enabled again in 60 seconds (wait for 1 minute and reload the Domoticz panel). |
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DCMD | Dombus Command: through this keyword it's possible to set a command to send to the same or another module, when an event occurs. In this way, when an event occurs, the module send a command to a dombus module to execute an operation, and this work without the need of a Domoticz controller and without the need to configure Domoticz to manage this kind of actions. See the DCMD section below. |
This is an experimental function, undergoing testing and development, available on all DomBus modules, expept DomBus1
For each port it's possible to configure, through the Domoticz Description field, one or more DCMD commands.
DCMD is a command that is sent to the module itself or to another DomBus module, in response to an event, and more DCMD commands can be specified for the same event and port. Also it's possible to send DCMD command to the domotica controller to deactivate, activate or toggle a scene/group.
The syntax is DCMD(Event:ValueLow:ValueHigh)=ModuleAddress.ModulePort:Command:Value
where ValueLow, ValueHigh, Value are optional parameters.
When ModuleAddress corresponds to the same module that we're editing, the command is executed locally, by the same module.
When ModuleAddress corresponds to another Dombus module, the command is sent by bus to that module. When ModuleAddress is 0, the command is sent to the controller to activate the scene/group with idx=ModulePort : please note that ModulePort should be in hex format, so if ModulePort=11 the scene/group with idx=17 will be activated.
Event | Description | Example |
OFF | This even occurs when input goes OFF | DCMD(OFF)=13.1:OFF When input goes off, turns OFF also port 1 of module 13 |
ON | This even occurs when input goes ON |
DCMD(ON)=13.2:ON:90s |
PULSE | Input is pulsed ON for less than 0.5s | DCMD(Pulse)=13.3:TOGGLE When input is pulsed shortly, send command to module 13 port 3 to toggle it's output OFF->ON or vice versa |
PULSE1 | Input is pulsed ON for about 1s |
DCMD(Pulse1)=13.3:ON |
PULSE2 | Input is pulsed ON for about 2s |
DCMD(Pulse2)=13.3:OFF |
PULSE4 | Input is pulsed ON for about 4s |
DCMD(Pulse4)=13.4:ON:2h |
DIMMER | ||
VALUE | Sensor value is ≥ ValueLow and < ValueHigh Command is repeated every 30s if the comparison matches. |
DCMD(Value:0:20.5)=13.5:ON DCMD(Value:0:12.2)=31.7:ON DCMD(Value:0:100)=31.8:OFF |
Command | Description | Example |
OFF | Turns output OFF. If the optional Value is specified, output will be OFF for the specified time, then returns ON | |
ON | Turns output ON. If the optional Value is specified, output will be ON for the specified time, then returns OFF | |
TOGGLE | Change state to the selected output. If the optional Value is specified, wait the specified time before toggling output | |
DIMMER |
Command | Description | Example |
number | A number without any suffix should be multiplied by 31.25ms (seconds/32) | 1=31.25ms 3=93.75ms 16=500ms |
numberS | Number of seconds, from 1 to 3600 |
1s=1 second |
numberM |
Number of minutes, from 1 to 1440 | 1m=1 minute 10m=10 minutes 180m=3 hours |
numberH | Number of hours, from 1 to 43824 | 1h=1 hour 6h= 6 hours 72h=3 days |
numberD | Number of days, from 1 to 1826 |
1d=1 day |
IN_DIGITAL,INVERTED,
DCMD(Pulse)=0101.1:TOGGLE,
DCMD(Pulse1)=0101.2:ON:30m,
DCMD(Pulse2)=0101.2:OFF
IN_DIGITAL,INVERTED, DCMD(Pulse)=0.1:Toggle, DCMD(Pulse2)=0.2:On
In the description field of the temperature sensor we'll write
DCMD(Value:0:20.5)=0101.3:ON, (if temperature between 0 and 20.5°C, turns ON heater on output 3 of module 0x0101)
DCMD(Value:0:20.5)=0102.1:ON, (if temperature between 0 and 20.5°C, turns ON valve output 1 of module 0x0102)
DCMD(Value:20.8:50)=0101.3:OFF (turn OFF heater when temperature above 20.8°C)
DCMD(Value:20.8:50)=0102.1:OFF (turn OFF valve when temperature above 20.8°C)
Domoticz temperature sensor Description will be:
TEMPERATURE,
DCMD(Value:0:20.5)=0101.3:ON,
DCMD(Value:0:20.5)=0102.1:ON,
DCMD(Value:20.8:50)=0101.3:OFF,
DCMD(Value:20.8:50)=0102.1:OFF
Using RS485 specific cables it's possible to get almost 1km linear bus with several devices attached. Alternatively, it's possible to use 2 twisted pairs of cheap Cat6 UTP or STP cable, one twisted pair for data (A and B) and one for 12-24V power supply. Ideally, all devices should be connected using a linear bus topology, to get the lowest reflection/noise, and connect 100-150 Ohm resistor on the two ends, as illustrated in the Fig. 2. In practice, this is not important for common buildings.
At Raspberry/PC side, it's possible to use a cheap USB-RS485 adapter, if a serial port with RS485 driver is not already available.
Using DomBus modules it's possible to:
Click here if you need to write a microSD card with a clean updated Raspbian+Domoticz image optimized to extend SD life (minimizing writings), and with some addons (firewall, backup, libraries).
This procedure is not needed in case of a new Domoticz installation writing the SD as written above.
If Domoticz does not already include the DomBus plugin, type the following commands (from Linux root shell: type sudo su - to become root):
#install git, if not already installed
which git
if [ $? -ne 0 ]; then sudo apt install git; fi
#change to the domoticz directory / plugins
cd /home/pi/domoticz/plugins
#fetch the Python Plugin Manager (that can be used to install/upgrade other plugins, including Creasol DomBus)
git clone https://github.com/ycahome/pp-manager
#fetch Creasol Plugin
git clone https://github.com/CreasolTech/CreasolDomBus
#restart Domoticz daemon
service domoticz restart
After plugins installation and Domoticz restart, it's possible to add the Creasol DomBus hardware (Setup->Hardware , add new "dombus" hardware type "Creasol DomBus" and specify the serial device, normally /dev/ttyUSB0) and connect the DomBus device to the RS485 bus.
DomBus module is factory programmed with a default address indicated above, and only one port will be automatically added to the Switches panel of Domoticz. Enter the Switches panel, find the new device with the DomBus default address, click on Edit and add in the description ,HWADDR=0x0001 to set the new address to 0001, or specify another address of your choice. Reload the Switches panel to see all input/output/led ports of DomBusTH active.
With Domoticz, each DomBus port can be configured via the Domoticz device description: for example a port IN_DIGITAL normally is On when it's left unconnected, and Off when it's shorted to GND, but it's possible to invert this function specifying in the device description the parameter INVERTED, separated by a comma (,): IN_DIGITAL,INVERTED . Relay outputs can be configured writing in the description field OUT_DIGITAL or OUT_RELAY_LP: in the latter case, relay are internally managed to assure a low power consumption.
Please check the sections Ports capabilities and Ports parameters.
Ports that are not used can be disabled in Domoticz Setup → Devices clicking on the blue arrow of each useless port (device), but in case of a bus with almost 255 ports, it's suggested to disable the unused ports by using the DISABLE command:
1. suppose that DomBus module 0x0001 has ports 3,4,5,6,8 not used
2. in Domoticz Switches panel select port1 of that module ([0001.1] RL1)
3. click on Edit, and add in the Description field DISABLE=3:4:5:6:8 and click on Save.
In this way, the selected ports will be disabled and removed from the Devices list. With this solution it's possible to add more DomBus modules to the same bus, with up to 255 enabled ports.
In large buildings, it's a good practice to have more than one bus, to divide floors or areas.
cd /tmp
git clone https://github.com/CreasolTech/home-assistant-creasol-dombus.git
cp -a home-assistant-creasol-dombus/custom_components HADIR/config/
ha core restart
where HADIR is the Home Assistant root dir: in case of Hassio, use the command cp -a home-assistant-creasol-dombus/custom_components /config/ATTRS{devpath}=="1.5" ATTRS{idProduct}=="7523" ATTRS{idVendor}=="1a86"
SUBSYSTEM=="tty", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", ATTRS{devpath}=="1.5", SYMLINK+="ttyUSBdombus1"to set that the USB/RS485 adapter plugged to the USB port 1.5 should be named /dev/ttyUSBdombus1
-- script_time_example.lua : simple example script that write a message to Telegram channel/group if temperature is less than 5 commandArray={} dofile "script/lua/globalvariables.lua" -- read a file with some variables, including Telegram API key and ChatID dofile "script/lua/globalfunctions.lua" -- read a file with some functions if (tonumber(otherdevices['Temp_outdoor']) < 5) then telegramNotify("Low temperature: bring flowers inside") -- send message by Telegram end return commandArray
Need help? join the DomBus channel on Telegram!
Esiste anche il Canale Telegram in Italiano DomBus_it!
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