domat UI300 User manual

domat UI300 12/2019 Subject to technical changes. 1
UI300
Communicative room unit
Summary
UI300 is communicatiove room unit with analogue input for PT1000 sensor, with
temperature sensor, humidity sensor, and control knob for setpoint control and
other settings. The binary output is controlled either on a remote basis, or as
thermostat, hygrostat. The units communicate over Modbus RTU / RS485 and
they can be used as open system components with majority of building control
system and controllers.
Different versions of unit may contain display, backlight and knob:
UI300 –basic version with display and knob
UI300BL –version with knob and display with backlight
UI300DK –version without knob and display
Application
▪Air handling units and air condition in rooms with variable load –
schools, cinemas, lecture halls etc.
▪Systems with water or electrical floor heating –control and measuring of
room temperature
▪Monitoring and recording of temperature indoors
Function
The units acquire temperature, and relative humidity in the room, temperature
correction (controlled by the knob) and required operation status which is set by short
push of the knob or in the menu. In the configurable menu following values can be set
and displayed:
–temperature, actual temperature correction
–humidity (actual value only at room units containing the humidity sensor)
–time (only display at room units with RTC)
–basic setpoint - day
–basic setpoint - night
–outside temperature for heating enable
–DHW temperature
–heating curve type (1...4)
–operation mode (Residential with Day, Night, Time schedule, Off, or Hotel /
Office with Comfort, Standby, Party, Off)

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–fan stage (Auto, Off, St.1, St. 2, St. 3)
–A/C mode (Auto, Heating, Cooling, Off, Fan only)
–weekly scheduler: 7 days, up to 6 events per day
–another 5 variables (air quality, fan speed etc.) –each has a profile where max.
and min. values, step, number of decimals, and symbol set are defined.
It is also possible to set / reset any of the LCD symbols on the display over Modbus.
The turn / push knob has three basic functions:
•instant edit (turning the knob) –settings of one predefined analogue value,
usually room temperature correction
•quick edit (short push) –change of predefined state, e.g. Presence (Comfort /
Standby / Off), Air condition (Auto / Heating / Cooling / Fan only / Off) etc.
•long push –jump to menu where values are listed by turning the knob, short
push selects the value to be edited, and the value is changed by turning the
knob followed by short push for confirmation.
After definable inactivity time, the display goes back to its basic state with rolling
display of selected values (e.g. actual temperature and humidity).
The unit Modbus address and functionality is defined over the RS485 interface with
service software ModComTool which is free for download at http://domat-
int.com/en/downloads/software To interface the room unit to the computer use the
USB/485 converter M080, RS232/RS485 converter R012, or any suitable RS485
converter.
____________________________________________________________________
Technical data
Power supply
24 V AC ±20%, 1 W
Temperature measuring range
-20 .. 70 °C (accuracy ±1 ˚C)
Humidity measuring range
10 až 90 % rH (accuracy ±3%)
Protection degree
IP20
Inputs
1x digital input for presence /window contact
1x analogue input for external temperature sensor
Pt1000
Outputs
1x solid state relay, zero switching, for AC load 24 V AC,
max. 0.4 A, AC1, general usage, non-inductive load
according to EN 60947-4-1, galvanic isolation 1.5 kV
Setpoint
according to configuration, +/- 10 to +/- 1 K
Communication
RS485 - Modbus RTU, slave
selectable speed 1200 ... 115200 bps, parity and bits are
set in service SW
default 9600/N/8/1
The interface is optically separated 1 kV.
Display
LCD 60 x 60 mm, symbol set see above
Terminals
recommended wire cross-section 0,14 –1,5 mm2
Cover
ABS, RAL9010, other colours

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Weight
0,17 kg
Dimensions
90 x 115 x 30 mm, see below
Ambient conditions
According to class 3K3 (+5 to +40 ° C, 5% to 85% non-
condensing relative humidity).
Storage conditions
According to DIN EN 60721-3-1 Climatic class 1K3 (-5 to
+45 ° C, 5% to 95% non-condensing relative humidity).
Standards conformity
EMC ed.3 EN 61000-6-2: 2005, EN 55022 ed.3:
2010 (industrial environment)
Electrical safety EN 60950-1 ed.2: 2006 + A11: 2009 + A12:
2011 + A1: 2010 + A2: 2014 + Opr.1: 2012
Restriction of hazardous substances EN 50581: 2012
Terminals
1
2
3
4
5
6
7
8
9
1: AIN exteral temperature sensor
Pt1000
2: AGND exteral temperature sensor
Pt1000
3: DI1 input (presence/window)
4: DO1 output for heating valve
5: G0 power, outputs –common point
6: G0 power, outputs –common point
7: G power
8: K- communication RS485 -
9: K+ communication RS485 +
DIP switches
Back of the PCB
BUS END: if ON, the bus is terminated (if
last device on the line)
USR: not used, reserved for future
applications
INIT: sets the controller into default
state and sets bus address to 1, baud rate
to 9600. To init, proceed as follows:
- connect the device over RS485 to a PC
with the ModComTool config tool
- set INIT to ON
- apply power (use only the connector
without bottom)
- find the controller in the tool (Scan)
- set INIT to OFF
- in the ModComTool, open the
controller window
- click the Init button in the tool
- remove and apply power.



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

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Type table
Type
LCD
Backlight
Knob
DI
DO
AI
t
rH
UI300
✓
✓
1
1
1
✓
✓
UI300BL
✓
✓
✓
1
1
1
✓
✓
UI300DK
1
1
1
✓
✓
Installation
Units are intended for operating in a normal and chemically non-aggressive
environment. They do not need any servicing or maintenance. Install them in a vertical
position at places where they can be operated easily and measure correct values of
temperature, i.e. in the height of about 150 cm, with no direct sunlight or other heat /
cool source (AHU outlets, refridgerator, electrical appliances). The device consists of
two parts: bottom with screw terminal block and cover containing PCB, display, and the
knob. The bottom part is fixed by 2 or 4 screws to any flat surface or a flush-mounting
box Ø 50 mm. At the back of the bottom there is an aperture for cabling. The bottom
should be installed and cabling connected first, and the upper part inserted after the
construction works have been finished to prevent damage to the unit.
Seal the conduits to avoid influencing the sensor by draught. Use insulating pad when
installing the sensor on cold walls. Avoid sensor exposition to sunlight or other heat
sources.
Opening the
cover
When removing the display part, proceed as follows:
-press gently the side parts of the unit and pull the right of the display part by
several milimeters
-pull the left of the display part
-pull the display part and remove it from the bottom.
Do notbend the display part too much, the connector pins could be damaged. The locks
are only at the sides of the display part, not at the top nor bottom.

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Communication
The units communicate with a controller (master) over RS485 using Modbus RTU and
thus they can be used in a number of control and SCADA systems. The register
description is available in a separate document Room units UI... –Communication
description. User manual for domat.exe and detailed description of the room unit
functions find in the document Room units configuration –User manual.
Display
A large (60 x 60 mm) display clearly shows
actual room temperature and controller
status with 7-segment digits and standard
Day, Night, Off, and Time scheduler
symbols. Active output is indicated by a
heating symbol. In the upper part, there are
week days used for time scheduler setup.
Other symbols are not used.
LCD symbol set
Dimensions
UI300, UI300BL

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UI300DK
All dimensions in mm.
Safety note
The device is designed for monitoring and control of heating, ventilation, and air
conditioning systems. It must not be used for protection of persons against health risks
or death, as a safety element, or in applications where its failure could lead to physical
or property damage or environmental damage. All risks related to device operation
must be considered together with design, installation, and operation of the entire
control system which the device is part of.

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Changes in
versions
09/2019 –First datasheet version.
12/2019 –I/O position corrected.