Creasol Dombus1 User manual

Made in EU

Creasol DomBus1

RS485 bus expander for Domoticz with

3 relays, 6 inputs and one 30Vac input

DomBus1 is designed to easily expand the number of I/Os of home automation systems using

Domoticz sof tware (on Raspberry or other hardware) minimizing the power consumption.

It can be supplied from 5 to 5Vdc, and power consumption is really low: at 1 V, for example,

3mA in standby, 10mA with 1 relay ON, 17mA with relays ON, 4mA with 3 relays ON.

One or multiple DomBus boards can be connected via RS485 bus, so using a 4-wires cable it's

possible to implement a network of I/O and sensors where wires are for data and for power

supply (from 5 to 4Vdc).

LEDs, connected on all inputs, outputs and bus, are enabled by pressing the Prog button and stay

acti e for 60 seconds, then will be OFF until Prog button is pushed again.

Red LED between A and B terminal blocks indicates the serial bus transmission.

Relay outputs are configured for low power mode, consuming less than 30% of the power

normally needed by relays, so they can be used for outputs that stay ON for long time (alarm/security

signals, night lights, ...).

The switching mode power supply, LEDs-enable and low power relay outputs features, lead to a

full control of inputs/outputs with an optimized power consumption.

Full instructions and domoticz plugin are a ailable at www.creasol.it/CreasolDomBus1

Features and specifications

•Switching mode power supply unit, con erting 7.5-25Vdc input

oltage to 5V: standby current is 6mA @5Vdc, 3mA @12Vdc, 2mA

@24Vdc.

•RS485, 115200bps half duplex (2 wires bus) with 32bit

microcontroller

•3 relay outputs (250V 5A switch capability with non-inducti e load.

In case of inducti e load, switch current is lower).

•All 3 relays can be configured in low power mode: relay current

consumption is reduced to 7mA @12V instead of 25mA @12V

(normal relay current).

•6 inputs, fully configurable, with internal pull-up to 5V.

•Optionally, it's possible to configure 2 or 3 “inputs” to be connected

to 1 or 2 waterproof ultrasonic distance sensors.

•1 230V AC input (with optocoupler), suitable to sense AC oltage:

connect the two blue-wires to a de ice to check if it is powered or

not (e.g. to a oid power disruption to heat pump or freezer).

•Optionally, it's possible to con ert the AC input to a low- oltage

solid state relay output (40V, AC or DC, 100mA), by adding an

integrated circuit and configuring that port as output in Domoticz.

•Domoticz automatically recognize a new DomBus de ice attached

to the RS485 bus, and automatically add the corresponding I/Os to

the switches panel.

•Easy way to configure I/O using the switch description (for example

it's possible to configure an output as normal or low power relay,

normally open or closed, writing the configuration in Domoticz

de ice description).

Installation

Using RS485 specific cables it's possible to get almost 1km linear bus

with more de ices attached. Alternati ely, 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. Be careful to connect all de ices using a

linear bus topology, to get the lowest reflection/noise, and connect 100-150 Ohm

resistor on the two ends.

At Raspberry/PC side, it's possible to use a cheap USB-RS485 adapter, if a serial port

with RS485 dri er is not a ailable.

Configuration

Domoticz plugin can be found at www.creasol.it/CreasolDomBus1 , where it's also

possible to find detail instructions for de ice configuration.

After plugin installation and Domoticz restart, it's possible to add the Creasol DomBus

hardware (Setup->Hardware) and connect the DomBus1 de ice to the RS485 bus: if a

DomBus1 has the default address 0xff01, only one port will be automatically added to

the Switches panel of Domoticz; in case the DomBus1 was already configured wih

another address, all ports will be added to the Switches panel in few seconds.

In the first case, go to Switches panel, find the new de ice “dombus - [Hff01] OUT1

Relay”, click on Edit and add in the description ,HW DDR=0x0001 to set the new

address to 0001. Reload the Switches panel to get all ports of DomBus1 acti e.

E ery I/O can be configured ia the Domoticz switch description: for example a de ice

type IN_DIGITAL normally is On when it's left unconnected, and Off when it's shorted to

GND, but it's possible to in ert this function specifying in the switch description the

parameter INVERTED, separated by a comma (,): IN_DIGIT L,INVERTED . Please

check the following sections I/O parameters and DomBus1 I/O capabilities.

I/O that are not used can be disabled in Domoticz Setup -> Devices clicking on the blue

arrow of each useless de ice (I/O).

I/O parameters

Parameter name Function

HWADDR=0xNNNN

This command set new address for the dombus de ice: reload the Switch panel to see the new de ices associated with the new address of DomBus. NNNN is

an exadecimal number, from 0x0001 to 0xff00, so 65280 combinations are a ailable. Keep note of address assegnated to each dombus de ice, because in

case of address conflict it's needed to switch off one of the conflicting de ice and program the remaining one to another address, or make a factory reset as

explained below.

INVERTED

Used to in ert the logic state of an input or output. Can be used in conjuction with OUT_DIGITAL, OUT_RELAY_LP, IN_DIGITAL.

Normally, domoticz switch is On if input is at logic le el 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 ice ersa.

OUT_DIGITAL Output is managed as digital, On when it's acti e and Off when it's disabled.

OUT_RELAY_LP Relay output managed in low power sa ing mode, to reduce relay coil current consumption at less than 30% of normal alue.

IN_DIGITAL Digital input, is On when the corresponding input is at high oltage le el (open), and Off when the corresponding input is at GND (shorted).

DISTANCE Set the current port as the echo output of ultrasonic distance meter: IN3 will be used to pro ide the trigger to the distance meter (see application schema).

Setting a de ice as DISTANCE, it will be mo ed to the Utility panel of Domoticz.

AFor analog and distance sensors: used to compute the real alue using the formula REAL_VALUE=A * VALUE_FROM_DOMBUS + B.

BFor analog and distance sensors: used to compute the real alue using the formula REAL_VALUE=A * VALUE_FROM_DOMBUS + B

DomBus1 I/O capabilities

Port# Name Capabilities Default configuration Description

1OUT1 Relay OUT_DIGITAL,

OUT_RELAY_LP OUT_RELAY_LP Relay output, that can be managed as standard relay (OUT_DIGITAL) or low power relay

(OUT_RELAY_LP)

OUT2 Relay OUT_DIGITAL,

OUT_RELAY_LP OUT_RELAY_LP Relay output, that can be managed as standard relay (OUT_DIGITAL) or low power relay

(OUT_RELAY_LP)

3OUT3 Relay OUT_DIGITAL,

OUT_RELAY_LP OUT_RELAY_LP Relay output, that can be managed as standard relay (OUT_DIGITAL) or low power relay

(OUT_RELAY_LP)

4IN1 IN_DIGITAL,

IN_ANALOG,DISTANCE IN_DIGITAL Normally it works as digital input, 0-5V

5IN2 IN_DIGITAL,

IN_ANALOG,DISTANCE IN_DIGITAL Normally it works as digital input, 0-5V

6IN3 IN_DIGITAL, IN_ANALOG IN_DIGITAL Normally it works as digital input, 0-5V

7IN4 IN_DIGITAL, IN_ANALOG IN_DIGITAL Normally it works as digital input, 0-5V

8IN5 IN_DIGITAL, IN_ANALOG IN_DIGITAL Normally it works as digital input, 0-5V

9IN6 IN_DIGITAL, IN_ANALOG IN_DIGITAL Normally it works as digital input, 0-5V

10 IN AC/OUT

SSR IN_AC, OUT_DIGITAL IN_AC INVERTED

230Vac line sensing, used to detect blackout or line oltage. DomBus1 board can be modified to replace

the circuitry with a 60V 100mA SSR (current consumption less than 1mA), suitable for controlling a siren

or other security de ice, heating system or another low oltage de ice.

Application note: measures the level of a ater tank, activates a valve for atering the

garden, turns on/off the night light and read magnetic contact sensors of door+blind

The following schema shows how to connect a waterproof ultrasonic distance sensor to Creasol DomBus1 to measure

the le el of water tank, so the garden irrigation program on Domoticz can determine if there is anough water in the

tank. DomBus1 returns the distance alue in mm, and it's possible to program the de ice to get a linear transformation

of this measure using the formula VALUE=A*mm+B. In this example, distance is measured in cm, the tank height is

200cm from the sensor, so to measure the le el of water A=-0.1 and B=200 , so when DomBus1 returns 1800mm of

distance (from sensor, placed in the top of tank, to water le el), VALUE=-0.1*1800+200=-180+200=20cm (le el of

water from the bottom of tank).

These parameters can be easily set in the de ice description: enter Switches panel, locate and edit the IN2 switch, and

write in the description DISTANCE,A=-0.1,B=200 and sa e: Domoticz automatically remo e the de ice from the switch

list and create a de ice in the Utility panel, showing the correct alue compute with the parameter A and B indicated.

DomBus supports at max 2 distance de ices, connected to IN1 and IN2; trigger to distance meters is sent using the

IN3 port, that is reser ed for this function and can be disabled on the Setup -> De ices (clickin on ).

As the Creasol DomBus1 de ice has many inputs and outputs, in this application note the same DomBus is used also

to acti ate the garden watering pump, acti ate the night lights, and control the magnetic contact sensors for a door and

blind, as like as the MCS tamper.

Factory reset

To restore default parameters, remo e power supply, push and hold the button Prog and supply the de ice: red led starts flashing; after 5 seconds it stops

flashing and de ice restores the configuration to default settings.

This procedure can be useful when 2 DomBus de ices ha e the same address and one of these cannot be disconnected or changed.

Safety information

The appliance must be disconnected from the power supply before carrying out any installation work. Electricity must be remo ed e en for the external

de ices connected to the board (e.g. ligths, pumps, electronic boards,... connected to the relay outputs).

Installation and maintenance must be carried out by a qualified technician, in compliance with the manufacturer's instructions and local safety regulations.

The electronic board must be installed into a well protected plastic enclosure, well protected by accidental contact with other metal objects.

Power supply must be protected by a fuse, as indicated in the application schema. External de ices can be connected to the board only if they meet the

specifications indicated in the Features and specifications section. The manufacture do not respond for improper use or connection of this de ice.

Disposal

The packing material is 100% recyclable and should be disposed in the appropriate recycle bins. The electronic board cannot be disposed as household

waste, but must be disposed of correctly or returned to the seller when purchasing a new equi alent product. Hea y fines can be imposed by local laws for

illegal disposal. By ensuring this product is disposed of correctly, you will help a oid potential negati e consequences for the en ironment and human health,

which could otherwise be caused by inappropriate waste handling of this product.

Warranty

The warranty complies with statutory requirements, and co ers only defect in material, workmanship or lack of conformity. Your local stockist should be

contacted in connecting with any warranty-related matters.

CE Declaration of Conformity