International and domestic moving head lights generally use DMX data format to write program files. The principle of DMX512: The speed of DMX data stream is 250K, that is, each BIT is standard 4 microseconds. The data format of DMX is divided into the following parts: 1) IDLE (idle) or NODMXsituation (case): when there is no DMX packet output, it will be a high-level signal; 2) BREAK: the start of the DMX packet is a 88 Forecast of low-level output in microseconds {head}; 3) MARKAFTERBREAK (MAB): MAB is a high level or 2 pulses of 8 microseconds after BREAK; 4) STARTCODE (SC) start code: SC is The channel data at the beginning of the data stream, which has the same format as the channel data, generally 11 pulses or 44 microseconds; 5) MARKTIMEBETWEENFRAMES (MTBF): MTBF can be 0-1 seconds, less than 1 second, starting from each channel MTBF can be high before the start bit; 6) CHANNELDATA (CD): the logical format of the channel data frame after SC is 1-512 or less than 512; 7) MARKTIMEBETWEENPACKETS (MTBP): after the valid data is sent Send high.
The effect of computer lights is generated by different scenes, different color changes, different viewing angles, horizontal and vertical light angle changes and speed, speed, stroboscopic speed, aperture size change, focal length change and other comprehensive performance. The work of all these attribute indexes is realized by the transmission of the stepper motor. The electrical operating parameters of the stepper motor are defined and programmed, and the control of the moving head light is completed.
