DMX512 Timing: Break, MAB, Slots and Refresh Rate
Why does a DMX universe refresh at most 44 times per second? The maths behind BREAK, MAB and 44 µs slots, the benefit of short packets, and timing-related faults.
The ANSI E1.11 DMX512-A standard: electrical specs, timing and history.
Why does a DMX universe refresh at most 44 times per second? The maths behind BREAK, MAB and 44 µs slots, the benefit of short packets, and timing-related faults.
Why 256 steps is not enough for pan. How coarse and fine channels combine, the maths behind 65,536 steps, and the cost in channel budget.
DMX512 is the one-way, 512-channel protocol behind almost every lighting rig. Channels, addresses, universes, cabling rules and where RDM fits in.
What happens when two sources feed one universe? The difference between HTP and LTP, which channels need which, and redundancy via sACN priority.
512 channels stop being enough quickly. What a universe is, how many you need, why bandwidth matters and how to plan universes on a large project.
One controller talks, every fixture listens. What master/slave really means in DMX, why addressing is what actually matters, and the fixture menu mode that causes confusion.
Why DMX512 appeared in 1986, how it became ANSI E1.11 (DMX512-A), and why RDM, Art-Net and sACN extended it instead of replacing it.