Hotel room automation via KNX is the most demanding application of KNX in residential contexts — combining lighting scenes, motorised curtains, HVAC control, DND/MUR status management, card reader entry activation, and integration with the Property Management System (PMS) for check-in/checkout automation. The MDT SCN-RT55.01 room controller (55mm flush format, 5.5" touchscreen, dual temperature sensor, room controller + thermostat combined) is the standard KNX room controller in 4-5 star hotel specifications across Europe. This guide covers the panel wiring, ETS6 group address structure, and PMS integration via KNX IP gateway.

Hotel room KNX panel architecture

Each hotel room has a dedicated zone in the KNX panel (typically located in the floor distribution room), or a room panel inside a service cupboard. Standard room equipment per 30m² hotel room: 1× MDT AKD-0202.01 (2-channel dimmer, 1A per channel, for bedside reading light + desk light), 1× MDT AKD-0802.01 (8-channel relay actuator for bathroom light, mirror light, corridor light, TV socket, air conditioning socket), 1× MDT JRM-0216.01 (2-channel blind actuator for blackout curtain + sheer curtain drives), 1× MDT WTC-0802.01 (fan coil controller, 0-10V output for variable speed fan, on/off chilled water valve, heating coil valve), 1× MDT BE-04UP.01 (4-channel binary input for door contact, DND/MUR card switch, window contact, bellboy call). Card reader entry: MDT CD16.01 (card insertion contact wired to MDT binary input channel — card inserted = room occupied, card removed = energy saving mode).

KNX group address structure for hotel rooms

3-level addressing with room number as second level: 1/[room]/0 = Main lighting (DPT 1.001 + 5.001). 1/[room]/1 = Bedside left. 1/[room]/2 = Bedside right. 1/[room]/3 = Bathroom light. 2/[room]/0 = Blackout curtain position (DPT 5.001, 0-100%). 2/[room]/1 = Sheer curtain position. 3/[room]/0 = HVAC setpoint (DPT 9.001). 3/[room]/1 = HVAC mode (DPT 20.102). 3/[room]/2 = Actual room temperature (DPT 9.001). 4/[room]/0 = Scene activation (DPT 18.001). 4/[room]/1 = Welcome scene. 4/[room]/2 = Relax scene. 4/[room]/3 = Night scene. 5/[room]/0 = DND status (DPT 1.001, 1 = do not disturb). 5/[room]/1 = MUR status (DPT 1.001, 1 = make up room). 5/[room]/2 = Card present (DPT 1.001, 1 = occupied). 5/[room]/3 = Door open (DPT 1.001, 1 = door open). This structure with 200 rooms: approximately 3,200 group addresses — within ETS6 project capacity (65,535 limit).

Scene programming for hotel rooms

ETS6 scenes (DPT 18.001) allow storing and recalling up to 64 scenes per actuator: Scene 1 = Welcome (lights 80%, curtains open 100%, HVAC comfort 21°C). Scene 2 = Relax (lights 30%, bedside 40%, HVAC 20°C). Scene 3 = Night (all lights off, blackout closed, HVAC night setback 18°C). Scene 4 = DND (lights unchanged, HVAC night 18°C, activate DND GA). Scene 5 = Checkout (all lights off, curtains 50% for housekeeping, HVAC economy 16°C, deactivate DND/MUR). Programming in MDT dimmer actuator: scene values stored in actuator non-volatile memory. On scene recall telegram (DPT 18.001, value = scene number): actuator sets all channels to stored values simultaneously — no delay between lights and curtains. SCN-RT55 touchscreen: scene buttons programmed in MDT SCN-RT55 visualisation editor (Windows application) — graphic icons for each scene, long-press to modify stored values from touchscreen.

PMS integration via KNX IP gateway

Property Management System (Opera PMS, Protel Air, Mews, Oracle OHIP) integration with KNX: the standard approach uses a KNX/IP gateway with a PMS driver. HMS Industrial Anybus Communicator (or dedicated KNX-PMS gateways from companies like Intesis, Loxbox Hotel) connects KNX IP Router to PMS via REST API or FIAS (Fidelio Interface Application Specification, port 5010). PMS checkout event → gateway writes KNX telegram to GA 4/[room]/0 = Scene 5 (checkout scene). PMS check-in event → gateway writes Scene 1 (welcome scene) + sets HVAC to comfort setpoint 21°C. DND status (KNX GA 5/[room]/0) → gateway reads and exposes to PMS housekeeping module — housekeeper app shows DND status for each room before dispatching cleaning team. MUR request (KNX GA 5/[room]/1) → gateway sends alert to housekeeping supervisor tablet. Card-out energy saving: card reader KNX GA 5/[room]/2 = 0 (card removed) → after 2-minute delay (prevents triggering on brief card removals) → Scene 5 economy settings activate — saves 30-40% HVAC energy per room for typical occupancy patterns.

MDT SCN-RT55 touchscreen configuration

MDT SCN-RT55.01 touchscreen (5.5-inch, 480×272 pixels, capacitive, 55mm flush format, HVAC thermostat + room controller combined): wired to KNX TP bus via 4-wire bus connection on rear. Power: KNX bus powered (additional power supply required for backlight — from separate 24V DC if bus PSU already near capacity). Configuration tool: MDT SCN-RT55 Config Software (Windows, free). Features: multi-page room controller with room temperature display, setpoint adjustment, scene buttons, curtain position bars, DND/MUR toggle, weather display (from KNX weather station GA). Configurable: page layout, icon design, colour scheme (match hotel brand colours). MDT SCN-RT55 is the most common 55mm hotel room controller in European KNX hospitality — specified in 4-5 star hotels from Portugal to Finland. Alternative: Zennio Z41 Pro (4.1-inch colour touchscreen, similar spec, more compact).