RFX-433EMC Transceiver
RFX-433EMC Transceiver
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Description ▼
RFXCOM RFX-433EMC
The RFX-433EMC is a 433 MHz USB / Wi-Fi / MQTT transceiver that bridges older RF devices into Home Assistant and other local controllers. It sends and receives on 433.92 MHz (and 433.42 MHz for Somfy RTS / Funkbus). The built-in EMC chip adds bidirectional motor support that the plain RFX-433 does not have. No cloud.
KEY FEATURES
- Transmit and receive on 433.92 MHz
- 433.42 MHz transmit for Somfy RTS and Funkbus
- USB-C, onboard Wi-Fi, and MQTT with auto-discovery
- Works with Home Assistant, Domoticz, OpenHAB, HomeSeer, Node-RED, and any MQTT broker
- Extended Motor Control for bidirectional Brel / Dooya / Motionblinds, Cherubini, and Ozroll
- Also covers switches, remotes, and many weather sensors (Oregon, La Crosse, FineOffset, and others)
- Local only — no vendor cloud
- ESP32-S3 firmware, field-updatable (Type 6)
- Made in the Netherlands
SPECIFICATIONS
| Category | Details |
|---|---|
| Model | RFXCOM RFX-433EMC |
| Receive | 433.92 MHz |
| Transmit | 433.92 MHz (most protocols) 433.42 MHz (Somfy RTS / Funkbus) |
| Modes | Send and receive |
| Interfaces | USB-C serial (RFXCOM protocol) Wi-Fi 802.11 b/g/n MQTT with Home Assistant auto-discovery Optional W5500 LAN module (sold separately) |
| EMC motors | Bidirectional Brel, Dooya, Motionblinds, mhz.de, Gaviota Elite, Cherubini, Ozroll |
| Also used for | Somfy RTS (not Somfy IO / 868) KlikAanKlikUit / Chacon / Nexa / ELRO / X10 style switches Oregon, La Crosse, Cresta, FineOffset weather sensors |
| Controller | ESP32-S3 + EMC secure microcontroller |
| Power | 5 V USB-C About 0.14 W typical Use a solid 5 V supply (2 A or better recommended for Wi-Fi / MQTT) |
| Software | RFX433 firmware Type 6 (USB / Wi-Fi / LAN / MQTT builds) RFXmngr on Windows for pairing and testing (not used with MQTT firmware) |
| Certifications | CE, RoHS |
What's Included:
- 1 × RFXCOM RFX-433EMC transceiver
- 1 × USB-C cable
NOTES
- No power adapter and no external antenna in the box. A magnetic-base 433 MHz antenna and a 5 V USB-C supply are optional
- Somfy IO (868 MHz) is not supported. Somfy RTS is
- Pair bidirectional motors as an extra remote. You cannot clone the original rolling-code remote ID
- Enable only the receive protocols you need — extra decoders cut sensitivity
- MQTT firmware and RFXmngr are not used at the same time. Flash the USB build for RFXmngr, or the MQTT build for Home Assistant auto-discovery
- This is not an RFXtrx433 / RFX433XL. Those older units use different firmware
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