Modbus variable list
Modbus
adress
Description Unit Default
value
Scale Min
value
Max
value
3 Hysteresis to calculate Heating and Cooling setpoint at Standby
state
K 140 10 10 400
4 DeltaT, temperature span for On/Off control K 10 10 5 100
5
Controller mode
0 = 2-pipe
1 = 4-pipe
-
0 1 0 1
6 Fan control
0 = No fan control
1 = Fan is controlled by heat command
2 = Fan is controlled by cool demand
3 = Fan is controlled by both heat and cool demand
-
3 1 0 3
7-10 Not used
11 Number of fan speed used
1 = 1 fan speed is used
2 = 2 fan speeds are used
3 = 3 fan speeds are used
-
3 1 1 3
12 Change-over mode
0 = Manual setting in display
1 = Manual Heat
2 = Manual Cool
3 = Automatic via AI1/DI1
-
20 1 0 3
13 Temperature difference to change to heating (control mode
change-over)
°C 30 10 10 250
14 Temperature difference to change to cooling (control mode
change-over)
°C 30 10 10 250
15 Switch on delay for terminal DI min 0 1 0 120
16 Switch off delay for terminal DI min 0 1 0 120
17 Remote setting of the current controller state
0 = Off
1 = No Action
2 = Standby
3 = No Action
4 = Occupied
5 = No remote control
-
5 1 0 5
18-29 Not used
30 Manual or Auto control of output for Heat valve (terminal Heat)
0 = Manual Off
1 = Manual On
2 = Auto (output is controlled by the heat demand)
-
2 1 0 2
31 Manual or Auto control of output for Cool valve (terminal Cool)
0 = Manual Off
1 = Manual On
2 = Auto (output is controlled by the cool demand)
-
2 1 0 2
32-33 Not used
34 Manual/Auto Fan control, 3-speed fan
0 = No fan speed active
1 = Fan speed 1 is active on DO FAN1
2 = Fan speed 2 is active on DO FAN2
3 = Fan speed 3 is active on DO FAN3
4 = Auto. Fan speed follows heat or cool demand according to
the application.
-
4 1 0 4
35-36 Not used
37 User defined setpoint adjustment (SP
adj
) set by using the
buttons on the front. Can be reset remotely.
0 = No current setpoint adjustment made
°C 0 10 -200 200
28 RCFD-230C manual, Rev. A
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