What is dmx512? DMX is the abbreviation of Digital MulTIpleX, which means multi-channel digital transmission. The DMX512 control protocol is the industry standard for data transmission of lighting controllers and lighting equipment released by the US Stage Lighting Association (usITT) in 1990. The full name is USITT DMX512 (1990), including electrical characteristics, data protocols, data formats, etc. .
The DMX512 protocol was first developed by USITT (American Theatre Technology Association) as a way to control dimmers from a console using a standard digital interface. The DMX512 goes beyond the analog system, but it does not completely replace the analog system. The simplicity, reliability, and flexibility of the DMX512 quickly make it the protocol of choice when funding is available. In addition to dimmers, a growing array of control devices is evidence. DMX512 is still a new field of science, with all sorts of wonderful techniques based on rules.
The DMX512 uses the EIA-485 standard.
Transmitter: logic "1" is represented by the voltage difference between two lines + (2 ~ 6) V;
The logic “0†is represented by a voltage difference between two lines of -(2~6)V;
Receiver: A is more than 200mv higher than B, which is considered to be logic "1";
A is more than 200 mv lower than B, which is considered to be a logical "0".
Because it uses 485 differential signal transmission, DMX512 port generally adopts 3-pin or 5-pin interface, and the corresponding wire is 1 pair or 2 pairs of twisted pair. The wire should be wrapped by foil or braided sieve at the same time. The XLR pin assignments are shown in Table 1 below, where the auxiliary data link can be used.
Based on EIA-485 transmission distance can theoretically reach 1200m, it is recommended to control within 800m, if you want to lengthen the transmission distance, you need to consider the repeater. The termination of the DMX512 data link should eliminate signal loops and signal reflections, which could result in misoperation of the properly designed system. Signal termination can be eliminated by means of junction termination resistors. The DMX512 standard requires that the termination resistor be placed between the data + and data-signal pins with an impedance range of 120 Ω + 5% to 120 Ω - 10%.
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