NRT405F901 manual Chapter 17 Modbus signals 39
Holding register
Name of signal Type
Modbus
address
Default setting Description
RC_Setp_X.NRTHeatOutputSelect X,3 3 2 Manual/Auto heating
RC_Setp_X.NRTCoolOutputSelect X,3 4 2 Manual/Auto cooling
RC_Setp_X.NRTFanSelect X,3 5 4 Select fan mode:
0 = Off
1 = Manual speed 1
2 = Manual speed 2
3 = Manual speed 3
4 = Auto
RC_Setp_X. NRTFanControlMode X,3 6 3 Select fan control:
0 = No control
1 = The fan is controlled by
heating requirement
2 = The fan is controlled by
cooling requirement
3 = The fan is controlled by
both heating and cooling
RC_Setp_X.NRTFanSpeed1Start X,3 7 20 Controller output signal in
RC_Setp_X.NRTFanSpeed2Start X,3 8 60 Controller output signal in
RC_Setp_X.NRTFanSpeed3Start X,3 9 100 Controller output signal in
RC_Setp_X.NRTFanSpeedHyst X,3 10 5 Controller output signal
hysteresis start/stop fan
speed
RC_Setp_X.NRTFanSpeedMax X,3 11 3 Number of fan speeds (1-3)
RC_Setp_X.NRTChangeOverSelect X,3 13 2 Manual/Auto Change-over
(0=Heating, 1=Cooling,
2=Auto)
RC_Setp_X.NRTRemoteState X,3 14 5 Used for remote control:
0 = Off
1 = Economy/Standby
2 = Economy/Standby
3 = Presence
5 = No remote control
RC_Setp_X.NRTUnitReturnState X,3 15 - Pre-set running mode:
0 = Off
RC_Setp_X.NRTUnitShutDownState X,3 16 0 Shutdown mode:
0 = Off
1 = Standby
Not used in this model X,3 17 -