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CoolAutomation CMNKNX2L CoolMaster KNX VRF/VRV gateway, up to 32 indoor units
✗
UL Listed
This product has not been certified by an NRTL (UL, ETL, CSA or
equivalent). Installation in USA projects may require a Field Evaluation
by a recognized laboratory. Consult your local AHJ before specifying.
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Low Voltage · SELV
This device operates on a Safety Extra Low Voltage circuit — such as
the KNX 29V bus or a DALI 16V bus (NEC Class 2). When powered by an
NRTL-listed power supply, many AHJs accept non-listed SELV devices.
Verify with your local AHJ before specifying.
Regular price
$2,668.50 USD
Regular price
-10%
$2,965.00 USD
Sale price
$2,668.50 USD
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The CoolAutomation CoolMaster KNX (CMNKNX2L) connects VRF/VRV systems and compatible splits from all major manufacturers directly to a KNX TP network. It wires to the HVAC communication bus (outdoor or indoor line, depending on brand) and exposes every indoor unit in ETS as group objects: on/off, mode, setpoint, room temperature, fan speed, louvers, error codes and more, with no per-unit interface needed in the ceiling.
Built for high-end residential and small-to-medium commercial projects with up to 32 connected units, it keeps Modbus RTU/IP, BACnet IP/MS-TP and REST API available on the same device, so a KNX system, a BMS and the CoolAutomation cloud apps can share one gateway. Configuration is done in ETS5 or later; the KNX line needs its own KNX power supply.
Key Features
- Direct KNX TP interface, configured in ETS5 or higher; each datapoint is built from indoor unit address, function and direction
- Up to 32 connected units (indoor units, CoolPlugs, sensors, fan coils); limits vary by HVAC brand
- Per-unit group objects: on/off, setpoint, room temperature, cool/heat, HVAC mode, fan speed (value, step, %), louver position, inhibit (window contact), filter alarm, error code and error presence
- Multi-brand, multi-line: several HVAC lines and brands on one device
- Also provides Modbus RTU, Modbus IP, BACnet MS/TP, BACnet IP, ASCII and REST API over RS232, RS485 and Ethernet
- Built-in color touch screen for line setup, unit discovery and local control
- Dry-contact GPIO for central all-on/all-off triggering (e.g. fire alarm)
- Optional CoolAutomation cloud apps for remote control and diagnostics (subscription)
Compatible HVAC Systems
VRF/VRV and selected split systems from Daikin (VRV and non-VRV), Mitsubishi Electric (City Multi VRF and splits), Fujitsu, Toshiba, Panasonic, Hitachi, Samsung, LG, Gree (GMV5/6), Midea, Haier, Mitsubishi Heavy, TICA, Blue Star, AUX and Chigo. Maximum indoor units and systems per line depend on the brand (for example Daikin VRV up to 64 indoor units and 10 systems per line). Send us your equipment list and we will confirm compatibility before you order.
Typical Applications
KNX homes and villas with ducted VRF, boutique hotels and serviced apartments, offices and retail where the KNX room controller, presence detector or window contact must drive the air conditioning directly.
Technical Specifications
| Power supply | 12–24 V DC; 100–240 V AC 50/60 Hz adapter included (12 V DC output) |
| Power consumption | 1.5 W |
| KNX | KNX TP; bus powered by a separate KNX power supply; ETS5 or higher |
| Max connected units | 32 (varies by HVAC brand) |
| Interfaces | KNX TP, RS232 (DB9), RS485, Ethernet 100 Mbps, USB (configuration), HVAC lines, GPIO (dry contact) |
| Protocols | KNX, Modbus RTU, Modbus IP, BACnet MS/TP, BACnet IP, ASCII, REST API |
| HVAC bus wiring | 2–3 wire shielded cable (brand dependent) |
| Max cable length to BMS | RS232 25 m (82 ft); RS485 1000 m (3300 ft); Ethernet 137 m (450 ft) |
| Display | 2.8 in color LCD touch screen, 240 × 320 |
| Mounting | DIN rail or wall |
| Dimensions (H × W × D) | 90 × 156 × 35 mm (3.54 × 6.14 × 1.37 in) |
| Weight | 265 g (0.58 lb) |
| Operating temperature | -10 °C to +60 °C (14 °F to 140 °F), 0–96 % RH non-condensing |
| Storage temperature | -20 °C to +70 °C (-4 °F to 158 °F) |
| In the box | Device, power adapter, Ethernet cable, USB cable |
| Certifications | FCC; CE (EN 60335-1, EN 60335-2-40). Not UL/NRTL listed |
| Manufacturer part no. | CMNKNX2L |
Related Products
CoolMasterPro KNX (up to 255 units plus local access to VRF service data). Without KNX: CoolMaster and CoolMasterPro. For split and mini-split units: CoolPlug + CooLinkHub. Underfloor heating zones: GS-SMT-HOA.
CE certified; not UL/NRTL listed — verify local code requirements before specifying in US installations.
Datasheet (PDF) · KNX/ETS integration guide (PDF) · Available to order.
Orders over $500 ship free within the USA (under 50 lbs). Orders under $500 carry a low cost shipping fee.
Most in-stock orders ship within 1–2 business days from Miami, FL. Delivery typically takes 3–5 business days depending on destination.
For freight or oversized orders, our team will contact you with a custom quote.
All KNXSupply products are covered by the manufacturer's warranty, ranging from 1 to 3 years depending on the brand. Warranty terms are fulfilled directly by the manufacturer.
If you experience any issue, contact us and we'll coordinate the claim process on your behalf.