The DMX (Digital Multiplexed) digital control protocol is predominantly used for stage lighting. In architectural lighting, this protocol is used for features such as media facades or stage-like room lighting effects. The data is transmitted via a dedicated 5-core cable at a transfer rate of 250 Kbits/s which can control up to 512 channels. Each luminaire must have a bus address. When using multi-channel devices with colour control and other adjustable features, each function requires a separate address. For a long time, the data transfer was unidirectional and only enabled the control of devices. It did not provide feedback on aspects such as lamp failure. The DMX 512-A version now allows for bidirectional communication.