PRELIMINARY - This product will be available in March 2021
Creasol DomBus12 is a compact module, 40x30x11mm, with 9 configurable inputs/outputs.
It can be connected to the Domoticz controller by a RS485 serial bus (4 wires, 2 for 12/24V power supply, and 2 for data at 115200bps).
As other DomBus devices, DomBus12 is designed to consume low power, be reliable, fully configurable and easy to use.
Features
- 4 configurable I/Os, each one can be set as analog/digital input, twinbutton input, digital output (can be connected to external relay board within relay driver)
- 2 configurable I/Os, each one can be set as open-drain output (to be connected to external relay), analog/digital input, blind output (to be connected to external relay), LED strip dimmer
- 3 configurable I/Os, each one can be set as analog/digital inputs, buzzer outputs, blind outputs (to be connected to external relay board), LED strip dimmer (to be connected to external mosfet)
- 7.5-35Vdc power supply (internally regulated by a switching mode power supply circuitry that minimize power consumption and dissipation)
- low power consumption: 2.5mA stand-by current at 13.6V (35mW)
- 115200 bps RS485 bus (max length: 1km)
Applications
Installation
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:
- avoid RF pollution
- no need to periodically change batteries on sensors/actuators
- using a UPS or 13.6V power supply with backup battery, it's possible to get a building automation system that works also in case of power outage
- very very low power consumption
Configuration
Writing a microSD card with a fresh Raspbian + Domoticz distribution
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).
Adding DomBus plugin to Domoticz
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):
if [ ! `which wget` ]; then sudo apt install wget; fi
cd /home/pi/domoticz # or other directory where domoticz is installed
wget -O /tmp/CreasolDomBus.tgz https://codeload.github.com/CreasolTech/CreasolDomBus/tar.gz/master
if [ ! -d plugins/CreasolDomBus ]; then mkdir -p plugins/CreasolDomBus; fi
tar xvzf /tmp/CreasolDomBus.tgz -C plugins/CreasolDomBus --strip=1
service domoticz restart
Domoticz configuration
After plugin 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.
DomBusTH is factory programmed with default address 0xff51, and only one port will be automatically added to the Switches panel of Domoticz. Enter the Switches panel, find the new device “dombus - [Hff51] OUT1”, 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.
Each device port can be configured via the Domoticz switch description: for example a device type 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 switch description the parameter INVERTED, separated by a comma (,): IN_DIGITAL,INVERTED . Please check the following sections Port parameters and DomBusTH port capabilities.
I/O that are not used can be disabled in Domoticz Setup -> Devices clicking on the blue arrow of each useless device (I/O).
I/O parameters
| Parameter name | Function |
| HWADDR=0xNNNN | This command set new address for the dombus device: reload the Switch panel to see the new devices associated with the new address of DomBus. NNNN is an exadecimal number, from 0x0001 to 0xff00, so 65280 combinations are available. Keep note of address assegnated to each dombus device, because in case of address conflict 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. |
| 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. |
| 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) |
| 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 | In DomBusTH there is 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 is less equal than 3V |
| 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 |
| DISABLE | Used to disable one or more ports: it can be usedful with large bus 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 setting, 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 of the current module. Port 1 can be never disabled. |
| 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. |
DomBus12 I/O/S capabilities
| Port# | Name | Capabilities | Default configuration | Description |
| 1 | IO | IN_DIGITAL, IN_ANALOG, IN_TWINBUTTON, OUT_DIGITAL | IN_TWINBUTTON | Input, with optional pullup (pcb jumper) |
| 2 | IO2 | IN_DIGITAL, IN_ANALOG, IN_TWINBUTTON, OUT_DIGITAL | IN_TWINBUTTON | Input, with optional pullup (pcb jumper) |
| 3 | IO3 | IN_DIGITAL, IN_ANALOG, IN_TWINBUTTON, OUT_DIGITAL | IN_TWINBUTTON | Input, with optional pullup (pcb jumper) |
| 4 | IO4 | IN_DIGITAL, IN_ANALOG, IN_TWINBUTTON, OUT_DIGITAL | IN_TWINBUTTON |
Input, with optional pullup (pcb jumper) |
| 5 | IO5 | IN_DIGITAL, IN_ANALOG, OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND, OUT_DIMMER | OUT_DIGITAL | Open-drain output, 60V 100mA capability, suitable to be connected to an external relay. With 2 pcb jumpers it's possibile to bypass mosfet and use this port as normal input/output. |
| 6 | IO6 | IN_DIGITAL, IN_ANALOG, OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND, OUT_DIMMER | OUT_DIGITAL | Open-drain output, 60V 100mA capability, suitable to be connected to an external relay. With 2 pcb jumpers it's possibile to bypass mosfet and use this port as normal input/output. |
| 7 | IO7 | IN_DIGITAL, IN_ANALOG, OUT_DIGITAL, OUT_BLIND, OUT_DIMMER | IN_DIGITAL | Input, with optional 150 ohm resistor that can be enabled by pcb jumper to drive external buzzer or relay board within relay driver |
| 8 | IO8 | IN_DIGITAL, IN_ANALOG, OUT_DIGITAL, OUT_BLIND, OUT_DIMMER, OUT_BUZZER | IN_DIGITAL | Input, with optional 150 ohm resistor that can be enabled by pcb jumper to drive external buzzer or relay board within relay driver |
| 9 | IO9 | IN_DIGITAL, IN_ANALOG, OUT_DIGITAL, OUT_BLIND, OUT_DIMMER, OUT_BUZZER | IN_DIGITAL | Input, with optional 150 ohm resistor that can be enabled by pcb jumper to drive external buzzer or relay board within relay driver |
(1): can be used as BLIND output, to open a blind/curtain, but only the previous port can be configured in Domoticz as OUT_BLIND because, when configured as OUT_BLIND, DomBus device automatically configure the next port to drive a relay in open direction.
Application notes
Hardware ChangeLog
Firmware ChangeLog
DCMD commands
This is an experimental function, undergoing testing and development, available on DomBusTH, DomBus12, DomBus23, DomBus31 modules.
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 same or to another DomBus module, in response to an event, and more DCMD commands can be specified for the same event and port.
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.
| 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 in the range between ValueLow an ValueHigh |
DCMD(Value:0:20.5)=13.5:ON DCMD(Value:0:12.2)=31.7:ON |
| 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 |
Examples 1: configure a pushbutton switch to have 3 functions:
short pulse => toggle ON/OFF light
1 second pulse => enable ventilation for 30s
2 seconds pulse => disable ventilation
This 3 events can be configured writing in the description of the pushbutton switch:
DCMD(Pulse)=0101.1:TOGGLE, (with a short pulse, toggle port 1 of module 0x0101)
DCMD(Pulse1)=0101.2:ON:30m, (with 1 second pulse => turn on port 2 of 0x0101 for 30 minutes)
DCMD(Pulse2)=0101.2:OFF, (with 2 seconds long pulse, turn OFF the port 2 of 0x0101)
The Domoticz switch Description will be
IN_DIGITAL,INVERTED,
DCMD(Pulse)=0101.1:TOGGLE,
DCMD(Pulse1)=0101.2:ON:30m,
DCMD(Pulse2)=0101.2:OFF
Example 2: temperature sensor that enable/disable electric heater and valve
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
FAQ about DomBus products
- How can I change address of DomBus1 device?
Click on the Edit button of that switch and add the following text to its description: ,HWADDR=0x0001 (don't forget the comma used to separate each parameter) to set the new address to 0001, ot another not-used value.
DomBus device will be set to the specified address, then you'll find in the Switches panel all ports with the selected address.
At this point you can add another new dombus device, and change its address in the same way.
- DomBusTH: how to do a factory reset?
Anyway, it's possible to do a factory reset in this way:
- Disconnect the device
- Solder the PCB jumper a to force IN4 in low impedance (150 Ohm resistor)
- Connect together IN1, IN2, IN3, IN4 wires
- Connect the device to the power supply: you can see a red flash 500ms long, that notify that configuration was restored to the factory default.
- If IN4 is used as input, remove the solder bump on PCB jumper a
- How many DomBus modules can I connect to a bus?
It's possible to have more than one bus, each bus associated to one RS485 port: for example for large buildings or if it's needed to differentiate the buses to increase system security, it's possible to use many RS485/USB adapters connected to Domoticz, one for each bus.
- Why DomBus device does not work?
2. Did you installed the Creasol DomBus plugin on Domoticz? If not, check the Configuration section above
3. If you open the Domoticz web panel, and enter Settings -> Hardware, can you find the Creasol DomBus protocol ? Did you enable it? If not, check the Configuration section above
4. When you connect the DomBus device to the RS485 bus, can you see a new device in the Domoticz Switches panel? if not, the device cannot communicate to Domoticz by RS485 serial bus. In this case, check that:
a) DomBus device is supplied by 12Vdc or similar voltage
b) RS485 bus is connected (A, B, GND) to Domoticz (Raspberry or other hw) through the USB/RS485 adapter or other RS485 adapter
c) Verify that the DomBus protocol on Domoticz is configured correctly (115200bps and right serial device), and that there are not 2 DomBus hardware with in Domoticz with the same serial port
- Why current consumption is 0uA?
DomBus1: first version of DomBus1 was not protected against polarity inversion, and switching mode power supply circuitry break down in case of polarity inversion opening the circuit. If you have a solder iron, you can try DomBus1 connecting a 5Vdc power supply to +5V indicated by the red arrow, and GND terminal block. Click to see the picture!
DomBusTH: Check polarity: the first wire (black) is ground (0V) and the second wire (brown) V+ (normally, +12V). DomBusTH is protected against polarity inversion.
Need help? join they DomBus channel on Telegram!
Esiste anche il Canale Telegram in Italiano!
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