The HDL M/PTL4.1 KNX Granite Display is a premium 4-inch full-touch KNX room controller. A single panel replaces multiple wall switches — controlling lighting, curtains, scenes, HVAC (AC/FCU), floor heating, music, and fresh air from dedicated UI pages with shortcut buttons on the home screen.

The display panel mounts on the HDL M/PCI2PE.1 KNX Panel Power Interface EU (required), which provides KNX communication plus auxiliary DC power. Built-in proximity, temperature, and humidity sensors wake the 720×720 LCD when users approach and expose room climate data on the KNX bus.

Key Features — 4-Inch KNX Touch Control

Display and Sensors

• 4-inch LCD: 720 × 720 px resolution with full-screen touch control.
• Proximity sensor: Screen wakes automatically when someone approaches.
• Temperature and humidity: Built-in sensors for HVAC logic and status display.
• Backlight: Adjustable LCD backlight; screen lock setting available.
• Finishes: Ashy Gray or Arctic Silver (black or white cover options).

Room Control Pages (ETS)

• Lighting: Up to 20 keys — switch, dimmer, RGB, and CCT control types.
• Curtains: Up to 8 curtains — open/close/stop, percentage, swing angle.
• Scenes: Up to 20 scenes; 3 shortcut scene buttons on home screen.
• AC/FCU: Up to 6 units — on/off, temperature, fan speed, mode.
• Floor heating: Up to 8 zones — modes Normal, Day, Night, Away, Timer.
• Music: 1 music player page; fresh air: 1 fresh-air controller.
• Navigation: 4 function navigation buttons + 1 main menu button on home screen.

At a Glance

Specification	Detail
Product type	KNX 4-inch granite touch display panel
Model	HDL-M/PTL4.1
Display	4-inch LCD — 720 × 720 px touch
Required interface	M/PCI2PE.1 Panel Power Interface EU
KNX bus	21–30 V DC — 12 mA at 30 V DC
Auxiliary power	20–30 V DC — 108 mA at 24 V DC (via PCI2PE)
Dimensions (W × H × D)	86 × 86 × 11 mm
Weight	101 g
Mounting	Wall box — slots onto PCI2PE interface
Protection	IP 20 (EN 60529)

Installation sequence, wiring via the power interface, and full parameter lists are under Technical Specifications. Datasheet is under Downloads.

Applications and KNX Integration

• Minimalist living and hotel rooms: One panel replaces banks of switches while retaining full KNX scene and HVAC control.
• RGB and tunable white: Dedicated lighting UI for colour and CCT fixtures — pair with HDL MOSFET dimming actuators or M/DALI.1 gateway.
• Presence-linked HVAC: Combine built-in temp/humidity with M/IS05.1 sensors or M/WS05.1 outdoor sensors for automation logic.
• IR-controlled AV and AC: Integrate with M/IRAC.1 Infrared Emitter for non-KNX equipment.
• System power: Supply the KNX segment from an HDL M/P960.1 960 mA Power Supply; link buildings over IP with M/IPRT.1 KNX net/IP Router.
• EAE alternative: For a 10-inch KNX touch panel with back-box, see the EAE MIOLA 10 Touch Screen.

Choosing HDL Touch Panels

The M/PTL4.1 Granite Display is HDL's compact 4-inch KNX room controller — always installed with the M/PCI2PE.1 back-box for bus + auxiliary power. For DIN-rail infrastructure (power, IP routing, actuators), combine with M/P960.1 and M/IPRT.1 in the distribution board.