Modbus variable list
Modbus address Description
6 Fan speed 2
0 = Fan speed 2 is not active on DO FAN2
1 = Fan speed 2 is active on DO FAN2
7 Fan speed 3
0 = Fan speed 3 is not active on DO FAN3
1 = Fan speed 3 is active on DO FAN3
8 Heat valve
0 = Heat valve is not active on DO Heat
1 = Heat valve is active on DO Heat
9 Cool valve
0 = Cool valve is not active on DO Cool
1 = Cool valve is active on DO Cool
10 Indicates the current change-over state of the controller
0 = Heating
1 = Cooling
This value may be set by either DI or Temp change-over control
11-19 Not used
20 Actual value on DI, before filters such as NC/NO
21 Not used
22 Actual value on DO FAN1, after filters such as NC/NO
23 Actual value on DO FAN2, after filters (such as NC/NO)
24 Actual value on DO FAN3, after filters (such as NC/NO)
25 Actual value on DO Heat, after filters (such as NC/NO)
26 Actual value on DO Cool, after filters (such as NC/NO)
C.4 Coils Register
Modbus address Description
1 Minimum fan speed. The fan runs at least at speed 1, except in Off state.
0 = Not Active
1 = Active
2 Mould protection
0 = Not Active
1 = Active
3-9 Not used
10 NC/NO for terminal DI
0 = NO
1 = NC
11-14 Not used
15 NC/NO for terminalHeat
0 = NO
1 = NC
16 NC/NO for terminal Cool
0 = NO
1 = NC
26 RCFD-230C manual, Rev. A
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