DMX-512 using the UART with Protocol Support APPLICATION NOTES
■DMX-512 is an industry standard protocol that is commonly used to control stage lighting and theatricaleffects like fog machines, and is commonly used for color changing LEDs. The latest 8-bit PIC®microcontrollers offer a new UART module that has built-in support for DMX-512 protocol. This modulealso supports other protocols such as DALI and LIN.
●Overview:
■This publication discusses the capabilities of the new UART module when operating in the DMX mode.Both the Controller and Receiver modes are supported in this module. This publication also shows how to use the Direct Memory Access (DMA) module with the UART module, which helps reduce CPU load.There are code snippets in this document that will help in setting up the module.
●DMX-512 Protocol:
■A DMX-512 system consists of a universe which is comprised of 512 channels. Each channel can have any value between 0-255. A DMX packet mainly consists of a burst of data (up to 512 data bytes). The position of the byte in the data stream determines which device in the DMX universe will respond to it.This protocol has a fixed baud rate of 250,000 bits per second. The data format for the protocol is defined as one start bit, eight data bits (LSb first), two stop bits and no parity bit.
■As a DMX controller, the device is supposed to send a start code before the 512 data bytes. These framed bytes are commonly known as slots. The first frame, which consists of the start code, is called slot 0 and the next frame is slot 1 and so on until slot 512.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2021/05/26 |
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DS90003204A;TB3204 |
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213 KB |
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