The OPT-LC-121 KNX Line Coupler is an advanced device that connects different KNX lines. Speeding up data communication and increasing system efficiency, it ensures secure and orderly communication between KNX lines. Thanks to its advanced filtering features, only the necessary telegrams are forwarded, reducing unnecessary data traffic within the system.

Secure and Efficient Communication
Thanks to its galvanic isolation, the OPT-LC-121 prevents electrical interference from passing between different KNX lines. This safeguards the system and ensures secure data transmission. Advanced filtering allows only the required telegrams through, which improves overall system performance.

Easy Configuration and Testing
Fully compatible with ETS 5 and above, the OPT-LC-121 offers straightforward installation and configuration. The buttons on the front panel allow the telegram filter to be temporarily disabled during testing, simplifying technical service and the commissioning process.

Instant Feedback with Status LEDs
The LEDs on the front panel keep the user informed of the KNX bus status and any communication errors in real time. These visual indications make it easy to monitor system health and quickly identify problems.

Powered from the KNX Bus
The OPT-LC-121 draws its power directly from the KNX main line and requires no external power supply. This makes installation faster and reduces the amount of wiring needed.

Secure Communication with KNX Data Security
With KNX Data Security support, the OPT-LC-121 enables communication on the bus to be encrypted and authenticated, preventing telegrams from being read or modified without authorisation. KNX Long Frames support allows larger data packets to be transmitted seamlessly, while the Security Proxy and Segment Coupler functions are available with the ETS 6 database.