Creasol DomBus31: 8 relays module for home automation system, with very low power consumption

Name: Creasol DomBus31: 8 relays module for home automation system, with very low power consumption
Brand: Creasol
SKU: creDomBus31
Price: 40.99 EUR
Availability: InStock

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Creasol DomBus31 is a din-rail relay module, 115x90x40mm, with 8 relays outputs. 6 relays are SPST (Normally Open outputs) with 250V 5A max capability, and 2 relays are SPDT (Normally Open and Normally Closed outputs) with 10A capability. 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, DomBus31 provides excellent performance in terms of power optimization: with all 8 relays active (the worst case), the power consumption is only 500mW! As a comparison, KMTronic 8 relays module consumes 12W, Denkovi 8 relays board consumes about 3W, Sonoff Dual R2 consumes 2W with only 2 relays enabled.

Suitable to be used as Domoticz relays module: using a simple 4 wire shielded cable it's possible to supply and interconnect up to 30 modules like this, through RS485 ModBus protocol already implemented in Domoticz (a plugin must be installed): RS485 is a strong communication system, easier to be connected than ethernet, with no RF pollution, and already includes 12/24V power supply in the bus cable.

Reference: creDomBus31

Protocol: Modbus RTU (compatible with almost any systems)

Modbus RTU (compatible with almost any systems)
DomBus (optimized protocol, working with Domoticz, Home Assistant, OpenHAB)

€58.56

€40.99 - 30%

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AVAILABLE IN TWO VERSIONS: DomBus protocol and Modbus protocol!
Creasol DomBus31 is a din-rail relay module, 115x90x40mm, with 8 relays outputs. 6 relays are SPST (Normally Open outputs) with 250V 5A max capability, and 2 relays are SPDT (Normally Open and Normally Closed outputs) with 10A capability. It can be connected to the almost any home automation system controller by a RS485 serial bus (4 wires, 2 for 12/24V power supply, and 2 for data at 115200bps 8,n,1).

As other DomBus devices, DomBus31 provides excellent performance in terms of power optimization: with all 8 relays active (the worst case), the power consumption is only 600mW! As a comparison, KMTronic 8 relays module consumes 12W, Denkovi 8 relays board consumes about 3W, Sonoff Dual R2 consumes 2W with only 2 relays enabled.

It supports two different protocols (at puchase time, select the needed protocol!):

DomBus protocol, that is supported by Domoticz home automation controller, is a reliable protocol that permits to manage dozens of modules and get status from modules as soon as they changes. Also it includes the so-called DCMD commands that, similarly to KNX, are transmitted between DomBus modules in the same bus to activate outputs in case of events (switch or pushbutton pressed, temperature value, power value, ....) without needing for the intervention or the home automation controller, useful solution to get a home automation system that works even in case of domotic controller fault. The Creasol DomBus plugin have to be installed in Domoticz, using the Python Plugin Manager or downloading the software from GitHub (see the section below).
Modbus RTU protocol, widely used in industrial and home automation systems, is supported by almost any domotic controller like Home Assistant, OpenHAB, IObroker, Node-RED, ...
Modbus is a master-slave protocol that permits to activate and deactivate a single relay, all relays or a group of relays by a single command. Also, it's possible to specify, for each relay, the ON time from 31.5ms to 1500 days, so the relay automatically switches OFF after the selected time.

Confused about the two versions? Using Domoticz, DomBus version is much better because includes enhanced features like DCMD. For other building automations, Modbus version should be chosen because compatible with almost everything.
Ask for support on Telegram group https://t.me/DomBus

The RS485 serial bus is the ideal solution to get:

easy wiring and connection: use a common thin alarm cable within 2x0.5mm² wires for 12V power supply, and 2x0.22mm² wires for data. This is much easier and better than ethernet connections.
robustness differential signalling permits to connect about 30 modules with more than 200m total distance. Modules can be connected together using a mix of linear/star bus topology.
very low power consumption: each module is supplied at 12V and has inside an high efficiency switching mode converter to minimize the power comsumption.
power outage toleran: using a 13.6V power supply with lead acid battery it's possible to supply all domotic network, IPCams, NVR, switches, routers, so the system keeps working even in case of power cuts out.
no RF pollution, no batteries

For large building, to improve the bus reliability, it's possible to make more than 1 bus so in case of fault, only the bus with fault will stop working.

Creasol DomBus 8 relay module for Domoticz home automation system

Features

6 relay outputs, SPST (normally open contact on screw terminal block) with 250Vac/30Vdc 5A contact (max 30Vdc in case of DC load, 250Vac in case of AC load).
2 relay outputs, SPDT (normally open and normally closed contacts on screw terminal block) with 250V 10A contacts.
Relays are divided in 3 blocks, each block respects the creepage distance from other blocks. Do not mix high and low voltage signals inside the same block!
8-35Vdc power supply (internally regulated by a switching mode power supply circuitry that minimize power consumption and dissipation).
low power consumption: 0.75mA @12V (9mW) stand-by current with all relays OFF, and 50mA @12V (600mW) with all relays ON.
115200 bps RS485 bus (max length: 1km), 8 bit data, no parity, 1 stop bit.

Warnings

Relays are divided in 3 blocks: do not mix high voltage (230V) loads and low voltage (5/12/24V) loads on the same terminal block!
Do not use capacitive loads with high inrush current (bad power supplies, ballasts, ...) otherwise the relay contact may weld.
Use a 4 wires shielded cable for the bus, using two lines to send power supply (12-14Vdc) protected by a fuse.
To reduce noise and reflections on the bus, enable the termination resistor (shorting Rbus PCB jumper) on the two furthest ends of the bus.

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DomBus31 DomBus capabilities (for the DomBus version)

Default address: 0xff31

Port#	Name	Capabilities	Default configuration	Description
1	RL1	OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND	OUT_RELAY_LP	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
2	RL2	OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND	OUT_RELAY_LP	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
3	RL3	OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND	OUT_RELAY_LP	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
4	RL4	OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND	OUT_RELAY_LP	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
5	RL5	OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND	OUT_RELAY_LP	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
6	RL6	OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND	OUT_RELAY_LP	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
7	RL7	OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND	OUT_RELAY_LP	SPDT relay output, NO + NC contacts, 10A 250Vac or 250Vdc output capability. Relay contact is protected by varistor
8	RL8	OUT_DIGITAL, OUT_RELAY_LP, OUT_BLIND⁽¹⁾	OUT_RELAY_LP	SPDT relay output, NO + NC contacts, 10A 250Vac or 250Vdc output capability. Relay contact is protected by varistor

(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.

DomBus31 Modbus RTU capabilities (for the Modbus version)

Default slave address: 49 (0x31)

Addr	Name	Values	Description
0	RL1	0=OFF, 65280=ON, 1-65279=ON for specified time	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
1	RL2	0=OFF, 65280=ON, 1-65279=ON for specified time	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
2	RL3	0=OFF, 65280=ON, 1-65279=ON for specified time	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
3	RL4	0=OFF, 65280=ON, 1-65279=ON for specified time	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
4	RL5	0=OFF, 65280=ON, 1-65279=ON for specified time	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
5	RL6	0=OFF, 65280=ON, 1-65279=ON for specified time	SPST relay output, NO contact, 5A 250Vac or 30Vdc output capability. Relay contact is protected by varistor
6	RL7	0=OFF, 65280=ON, 1-65279=ON for specified time	SPDT relay output, NO + NC contacts, 10A 250Vac or 250Vdc output capability. Relay contact is protected by varistor
7	RL8	0=OFF, 65280=ON, 1-65279=ON for specified time	SPDT relay output, NO + NC contacts, 10A 250Vac or 250Vdc output capability. Relay contact is protected by varistor
255	All relays	0=OFF, 65280=ON, 1-65279=ON for specified time	This address is used to switch ON or OFF all relays with a single short command
8192	Slave Address	1-250	Permits to change the slave address of the module, so it's possible to add new DomBusXX modules to the same bus

Application notes

Heating/ventilation system

The following simple diagrams represents the connection to a heat pump (controlled by low voltage signals), a ventilation system (controlled by low voltage signals) and a 3-vias valve (supplied by 230Vac).

With Domoticz it's easy to get heating/cooling system with heat pump, optimized to consume most energy from photovoltaic, and a air renewable controlled mechanical ventilation with chiller and coil that regulates the relative humidity to get the maximum comfort.

For security reasons, do not mix high and low voltage loads in the same block! For example it's not safe to connect, on Block3, a 230V valve to RL8 and a 12/24V valve to RL7! On each relay block it is possible to use only low voltage or only high voltage loads.

Controlling heat pump and ventilation by Domoticz + Creasol DomBus31 relay module

ADSL router controlled by Domoticz script to prevent hang-up

The following schema shows how to use the normally-closed contact of SPDT relay to supply a router.
A script will check that internet is working, and in case of failure activate the reset to turn power supply OFF for 10 seconds, resetting the router.

Supply a ADSL router by Domoticz + DomBus31 to prevent internet hang-up

Using DomBus31 with Modbus protocol with Node-RED

To be used with Node-RED, please assure that Modbus RTU version of DomBus31 has been chosen.

Install the modbus palette using the command npm install node-red-contrib-modbus

Creasol DomBus31 is factory programmed to use default slave address = 49 (0x31, can be modified through register 8192), using serial parameters 115200, 8bit, no parity, 1 stop bit.

MORE INFORMATION AT https://www.creasol.it/CreasolDomBus31

Smart-Home Creasol DomBus modules for Domoticz, Home Assistant, Node-RED, OpenHAB, ...

The following video shows a presentation of some domotic modules designed and produced in Italy by Creasol to make a reliable, easy and power-optimized home automation system.

The next video shows our Smart EVSE module that can be used to charge the electric car by using only solar power, or adding 25/50/75/100% of available power from the electrical grid.

Our industrial and home automation modules are designed to be

very low power (around 10mW with relays OFF)
reliable (no disconnections)
bus connected (no radiofrequency interference, no battery to replace).

Modules are available in two version:

with DomBus proprietary protocol, working with Domoticz only
with Modbus standard protocol, working with Home Assistant, OpenHAB, Node-RED

Home automation system using DomBus modules

Store website - Information website

For our products we can offer FULL SUPPORT and CUSTOMIZATION: please contact us by Email or Telegram

DomBusEVSE - EVSE module to build a Smart Wallbox / EV charging station

Complete solution to make a Smart EVSE, charging the electric vehicle using only energy from renewable source (photovoltaic, wind, ...), or adding 25-50-75-100% of available power from the grid.

Single-phase and three-phases, up to 36A (8kW or 22kW)
Needs external contactor, RCCB (protection) and EV cable
Optional power meter to measure charging power, energy, voltage and power factor
Optional power meter to measure the power usage from the grid (not needed if already exists)
Two max grid power thresholds can be programmed: for example, in Italy who have 6kW contractual power can drain from the grid Max (6* 1.27)=7.6kW for max 90 minutes followed by (6* 1.1)=6.6kW for another 90 minutes. The module can use ALL available power when programmed to charge at 100%.
Works without the domotic controller (stand-alone mode), and can also work with charging current set by the domotic controller (managed mode)

DomBusTH - Compact board to be placed on a blank cover, with temperature and humidity sensor and RGW LEDs

Compact board, 32x17mm, to be installed on blank cover with a 4mm hole in the middle, to exchange air for the relative humidity sensor. It can be installed in every room to monitor temperature and humidity, check alarm sensors, control blind motor UP/DOWN, send notifications (using red and green leds) and activate white led in case of power outage.

Includes:

temperature and relative humidity sensor
red, green and white LEDs
4 I/Os configurable as analog or digital inputs, pushbuttons, counters (water, gas, S0 energy, ...), NTC temperature and ultrasonic distance sensors
2 ports are configured by default as open-drain output and can drive up to 200mA led strip (with dimming function) or can be connected to the external module DomRelay2 to control 2 relays; they can also be configured as analog/digital inputs, pushbuttons and distance sensors.

DomBus12 - Compact domotic module with 9 I/Os

Very compact, versatile and cost-effective module with 9 ports. Each port can be configured by software as:

analog/digital inputs
pushbutton and UP/DOWN pushbutton
counters (water, gas, S0 energy, ...)
NTC temperature and ultrasonic distance sensors
2 ports are configured by default as open-drain output and can drive up to 200mA led strip (with dimming function) or can be connected to the external module DomRelay2 to control 2 relays.

DomBus21 - Power optimized module with 3 High Power latching relays, 1 AC input and 4 low voltage inputs

Very low power consumption module designed to enable up to 3 high power loads, up to 15A (3kW).

3x high power latching relays SPST 15A: latching relay consumes nothing when ON
1x 230V AC opto-isolated input used as power outage detector, and also as zero-crossing detector to permit switching relays On/Off minimizing in-rush current (for capacitive loads) and overvoltage (for inductive loads)
4x low voltage inputs, that can be connected to pushbuttons, switches, meters with pulsed output, NTC temperature sensors, ...

DomBus23 - Domotic module with many functions

Versatile module designed to control gate or garage door.

2x relays SPST 5A
1x 10A 30V mosfet (led stripe dimming)
2x 0-10V analog output: each one can be configured as open-drain output to control external relay
2x I/O lines, configurable as analog/digital inputs, temperature/distance sensor, counter, ...
2x low voltage AC/DC opto-isolated inputs, 9-40V
1x 230V AC opto-isolated input

DomBus31 - Domotic module with 8 relays

DIN rail low profile module, with 8 relays and very low power consumption:

6x relays SPST 5A
2x relays STDT 10A
Only 10mW power consumption with all relays OFF
Only 500mW power consumption with all 8 relays ON !!

DomBus32 - Domotic module with 3 relays

Versatile module with 230V inputs and outputs, and 5 low voltage I/Os.

3x relays SPST 5A
3x 115/230Vac optoisolated inputs
Single common for relays and AC inputs
5x general purpose I/O, each one configurable as analog/digital inputs, pushbutton, counter, temperature and distance sensor.

DomBus33 - Module to domotize a light system using step relays

Module designed to control 3 lights already existing and actually controlled by 230V pushbuttons and step-by-step relays. In this way each light can be activated by existing pushbuttons, and by the domotic controller.

3x relays SPST 5A
3x 115/230Vac optoisolated inputs
Single common for relays and AC inputs
5x general purpose I/O, each one configurable as analog/digital inputs, pushbutton, counter, temperature and distance sensor.

Each relay can toggle the existing step-relay, switching the light On/Off. The optoisolator monitors the light status. The 5 I/Os can be connected to pushbuttons to activate or deactivate one or all lights.

DomBus36 - Domotic module with 12 relays

DIN rail module, low profile, with 12 relays outputs and very low power consumption.

12x relays SPST 5A
Relays are grouped in 3 blocks, with a single common per block, for easier wiring
Only 12mW power consumption with all relays OFF
Only 750mW power consumption with all 12 relays ON !!

DomBus37 - 12 inputs, 3 115/230Vac inputs, 3 relay outputs

Module designed to be connected to alarm sensors (magnetc contact sensors, PIRs, tampers): it's able to monitor mains power supply (power outage / blackout) and also have 3 relays outputs.

12x low voltage inputs (analog/digital inputs, buttons, alarm sensors, balanced double/triple biased alarm sensors, counters, temperature and distance sensors, ...)
3x 115/230Vac optoisolated inputs
2x relays SPST 5A
1x relay SPST 10A

DomBus38 - 4 SPDT 10A relays, 2 SPST 10A relays, 1 AC input, 12 low voltage inputs

DIN rail module designed for burglar alarm system.

4x relays SPDT (normally open + close contacts), 10A
2x relays SPST 10A
1x 115/230Vac optoisolated inputs, that can be used to monitor 230V voltage presence (blackout detector) and it's also used as zero-crossing detector to minimize in-rush current and overvoltage when a relay switches On/Off
12x low voltage inputs (analog/digital inputs, buttons, alarm sensors, balanced double/triple biased alarm sensors, counters, temperature and distance sensors, ...)

DomBusTracker - Smart dual-axis sun tracker to optimize photovoltaic production

DIN rail module that control azimuth + elevation/tilt motors of a sun tracker, to maximize photovoltaic energy production during the day and seasons.

Uses a deep-hole sun sensor, to optimize production with both sunny and cloudy weather
Works in stand-alone mode (no need for external controller)
Can be connected to Domoticz for monitoring and controlling the motors position

DomRelay2 - 2x relays board

Simple module with 2 relays, to be used with DomBus modules or other electronic boards with open-collector or open-drain outputs

2x 5A 12V SPST relays (Normally Open contact)
Overvoltage protection (for inductive loads, like motors)
Overcurrent protection (for capacitive laods, like AC/DC power supply, LED bulbs, ...)