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Users of this software are assumed to have basic knowledge of electronic devices and how to wire them.
DMX512 (Digital Multiplex or DMX for short) is a standard for digital communications used to control stage lighting and effects. It's been around a long time, but is simple and very reliable.
A series of 512 bytes of data is constantly sent over a shared bus line. Each of these bytes is a 'channel' and starts with channel 1. The last channel being 512.
Devices (like lights) on the bus line are assigned addresses. The address is what 'channel' the device needs to look at. Devices can and most likely will look at several channels. So a 3-channel light assigned to address 4 will look at channels 4, 5 and 6.