CX40 — 4″ KNX capacitive touchscreen for room control, silver

About the CX40

The CX40 is a Zennio room controller with a square 4-inch capacitive screen that works in portrait orientation only; the menu uses a 3 × 3 grid and a page a 3 × 2 grid, so its 9 pages hold up to 54 controls and indicators^[1]. It runs two independent thermostats^[2].

The controller needs no separate power supply, but it draws up to 36.9 mA at 29 V and up to 45 mA at 24 V from the KNX bus^[2]. It weighs 103 g and operates at 0…+55 °C^[2]. The four inputs take a temperature probe, motion sensors and push buttons or dry-contact sensors^[2].

Fitted to the USB-C port, a ZACCO2S dongle lets the controller read CO₂ with ±50 ppm accuracy^[3], report the level to the bus and run configured actions when CO₂ reaches set values^[1]. A separate CO2 Control function regulates the CO₂ in the room by ventilating it^[1]. With the dongle the bus voltage must be 24–31 V DC; without it the controller accepts 21–31 V^[3][2].

Technical Specifications

Documentation

Manufacturer documents are in English

All Zennio documentation by reference →