DimmerLink Not Detected on I2C: UART Mode Default Issue Feb 26, 2026 0 61 FAQ TL;DR: DimmerLink ships from the factory in UART mode . i2cdetect will not show address 0x50 until you send the SWITCH_I2C command ( 02 5B ) over UART at 115200 baud. Also add 4.7 kΩ pull-up resistors... I2C ac-dimmer dimmerlink troubleshooting Read more