The ABB RoomTouch 4-inch KNX Control Panel is a freely programmable flush-mounted touch panel with a 4″ IPS display at 480 × 480 resolution. Up to 12 control elements can be distributed across a maximum of 12 pages, replacing multiple conventional switches with a single glass-front device.

The panel supports KNX Data Secure and occupies one bus subscriber address. It requires an external SELV power supply (20 … 32 V DC) for the display and logic. Built-in sensors — proximity, brightness, and temperature — plus 10 logic functions, 10 weekly timers, and 12 fault/alarm messages enable room-level automation without additional hardware.

Key Features — 4″ Touch Panel

Display and Control

• 4″ IPS touchscreen: 480 × 480 px resolution with haptic feedback.
• 1 … 12 control elements: Switching, dimming, sliders, blinds, RGBW, scenes, RTC, and display elements.
• Page layout: Up to 12 pages with a maximum of 4 touch surfaces per page.
• Proximity wake: Display activates on approach; brightness sensor adjusts to ambient light.
• Integrated RTC: One temperature controller with internal sensor; optional external PT1000 input.

Logic and Security

• 10 logic functions and 10 weekly timers on-device.
• 12 fault and alarm messages with page display.
• 10 scene actuators and presence simulation.
• KNX Data Secure: Encrypted telegrams when enabled in the project.
• 1 binary input: External contact or PT1000 temperature sensor.

At a Glance

Specification	Detail
Product type	RoomTouch — 4″ KNX touch panel, 86 mm
Order codes	RT/U12.86.1-825 (glass black) · RT/U12.86.1-811 (glass white)
Display	4″ IPS, 480 × 480 px, touchscreen
Control elements	1 … 12 (max 12 pages)
Logic / timers	10 logic functions · 10 weekly timers
Sensors	Proximity · brightness · temperature (internal)
External power	20 … 32 V DC (SELV, required)
Bus load	1 KNX subscriber address
Dimensions (W × H × D)	86 × 86 × 42 mm (built-in depth 32 mm)
Weight	127 g
Protection	IP20

Full electrical ratings and classification codes are listed under Technical Specifications. KNX product manual, operating instructions, ETS application, Touch DCA commissioning tool, firmware, CAD, and EPLAN data are under Downloads.

Order Codes — Finish Variants

Finish	Order code	Product ID
Glass black	RT/U12.86.1-825	2TMA310011B0003
Glass white	RT/U12.86.1-811	2TMA310011B0001

Applications and KNX Integration

• Living and bedroom control: Replace multi-gang switches with a single glass panel for lighting, shading, and HVAC.
• Commercial reception areas: Scene recall, alarm display, and proximity wake for public-facing installations.
• Room-level RTC: Integrated temperature controller with internal sensor or external PT1000 probe.
• Server visualization: Complements a central CT/S2.1 APP-Control Server for whole-building control from mobile apps.
• Universal I/O alternative: Where conventional push-buttons are retained, use a US/U2.3 Universal Interface or US/U4.3 behind the plate instead.

Choosing RoomTouch vs Other Panels

The RoomTouch 4″ is ABB's compact glass-front KNX touch panel for 86 mm European mounting. It requires external 20 … 32 V DC power — typically from an SV/S 30.640.3.1 auxiliary output or a dedicated SELV supply. For server-based whole-building visualization with Modbus/BACnet bridges, add a CT/S2.1 APP-Control Server in the distribution board.