Issue Date: 06.04.2021
Page 4 / 12
Thermokon Sensortechnik GmbH, Platanenweg 1, 35756 Mittenaar, Deutschland · tel: 02778/6960-0 · fax: -400 ·
LCF02-5DO_Datasheet_en.docx © 2021
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FUNCTION DESCRIPTION
Communication Modbus
Communication-section
1..247
Factory default:
1
Address 0:
broadcast address
Communication-Interface:
RS485
Communication-Protocol:
Modbus-RTU
Baud Rate:
4800 bps / 9600 bps / 19200 bps / 38400 bps (optional)
Factory default:
9600 bps
Parity:
no parity / odd parity / straight parity (optional)
Factory default:
no parity
Data:
8 bit
Stop:
2 bit
During device start-up the version and type number are displayed on the start screen for a short time.
While the fan coil thermostat is communicating via the bus, the communication symbol
starts flashing. If the device does not communicate
via the bus, the symbol will be disappear after 10 seconds.
Parameter table
To enter the parameter table, press the “Mode Key for more than 5s. Once the Display comes on, it will prompt for the password (default 987). The
password can be entered digit by digit. Each digit can be increased / decreased using the “▲”or “▼” keys. With the “Mode Key”
the next digit will
be selected.
Each parameter can be increased / decreased using the “▲”or “▼” keys. With the “Mode Key” the display will move on to the nex
t parameter.
Once the end of the table is reached the parameter setting will be exited to normal operation.
No.
Name of parameter
Parameter definition
Factory default
1
Modbus address
ID.1- ID.247
1
2
Baud rate
1 = 4800bps | 2 = 9600 | 3 = 19200 | 4 = 38400
2
3
Parity
0 = none | 1 = even | 2 = odd
0
4
Stop Bits
1 = 1 Stopbit | 2 = 2 Stopbits
2
5
Temperature Offset
Internal
Sensor
-5,0 K..+5,0 K
0
6
Temperature Offset
External Sensor
-5,0 K..+5,0 K
0
7
Piping system
0 = 2-pipe | 1 = 4-pipe
1
8
Reset to Factory Settings
Setting Parameter to 1 and press the Mode Key resets the device to
factory settings. Device stays in Parameter menu for Modbus
configuration
0
The Fancoil controller is designed for fan coil units with 2- or 4-pipe systems for heating and cooling. The selection of the fan coil system has to be
done via the parameter No. 7.
Heating/ cooling with 2-point-/ 3-point-controller
(Register address 0x0130)
In the case of temperature control, the 2-point controller only knows the switching states heating ON and heating OFF. The 3-point controller also
knows the switching state of cooling. Two - and three-point controller work with a hysteresis.
Heating/ cooling with PI-controller (PWM)
(Register address 0x0130)
The time response of the PI control loop depends on the control parameters xp for the proportional area and tn for the reset time of the integral
range. In case of an error, the P portion immediately changes the position value proportionally to the error variable, while the integral portion takes
effect after a certain time. The resulting actuating variable is output as a pulse-width-modulated signal directly to the outputs.
