The thermostat's operating mode can be influenced in different ways (see below). Specific heating and cooling setpoints are assigned to each operating mode.
Room operating mode: State
The thermostat sends the effective room operating mode on the bus.
The following operating modes are available:
Auto Timer 
In Auto Timer mode the room operating mode is commanded via bus.
Auto Timer is replaced by Comfort when no time schedule via bus is present
Comfort 
In Comfort mode, the thermostat maintains the Comfort setpoint. This setpoint can be defined via parameters P8, P9 and P10.
It can be locally adjusted via the +/- buttons or via bus.
Presence detector
(RDF600KN…)
In Comfort mode, the fan can be set to automatic or manual fan speed: Low, medium or high.
Standard presence mode:
The thermostat switches to Comfort mode when the presence detector (local or on KNX) is active (room is occupied). *)
Hotel presence mode:
When hotel guests leave their rooms, the thermostat switches to Economy mode and the local HMI (keys) is locked. Upon occupancy, the thermostat returns to the previous operating mode set by the hotel guests.
Economy 
The setpoints (less heating and cooling than in Comfort mode) can be defined via parameters P11 and P12.
The thermostat switches to Economy mode when...
the operating mode button is pressed (only possible if parameter P02 is set to 2)
Room operating mode: Window state
(RDF301…)
Economy is sent via bus
an operating mode switchover contact on RDF301…(e.g. keycard contact presence detector, window contact) is active. *)
"Window state" is sent to the RDF301 via bus, e.g. from a KNX switch or a KNX presence detector (P02 is irrelevant) *)
Protection 
In Protection mode, the system is...
protected against frost (factory setting 8 °C, can be disabled or changed via P65)
protected against overheating (factory setting OFF, can be enabled or changed via P66)
No other operating mode can be selected locally if Protection mode is commanded via bus. and are displayed.
Room operating mode: Window state
(RDF600KN…)
The thermostat switches to Protection mode when...
the operating mode button is pressed
Protection is sent via bus
the window contact on RDF600KN, RDF600KN/VB is active (open window).
"Window state" is sent to the RDF600KN, RDF600KN/VB via bus, e.g. from a KNX switch *)
Note:
*) Refer to chapter 3.2.1 for detail regarding the operating mode switchover contact (RDF301...), window contact (RDF600KN…) and presence detector (RDF600KN…).