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7) DMX 512 Information

The following information is a summary of the USITT 1990 standard for dimmers and

controllers. A complete copy may be obtained from:

USITT

10 W. 19th ST.

Suite 5A

New York, NY 10011-4206

Several web sites exist that have an abundance of information regarding DMX-512. As

with any Internet information, consider the source.

The DMX 512 standard is designed as a simple, reliable system for connecting digital

dimmers and controllers. The protocol allows up to 512 dimmers to be connected to a

single control console. With 512 dimmers in a system, DMX 512 allows each dimmer

level to be updated 44 times each second.

Connectors

The DMX standard specifies the use of 5 pin XLR connectors. DMX 512 currently uses 3

pins of the 5 pin connector. Pins 4 and 5 are reserved for future use. Some

manufacturers are using these pins for communications back from the dimmer to the

control console, or as a redundant data line.

The connectors to be used for DMX 512 are as follows:

Console end (transmitter) Female 5 pin XLR

Dimmer end (receiver) Male 5 pin XLR

Some manufacturers of XLR connectors are Switchcraft, ITT Cannon, and Neutrik.

Cable type

Shielded twisted pair approved for EIA-422/EIA-485 use. Either one pair with shield or

two pair with shield may be used. Examples of such cable are:

Single pair: Belden 9841, Alpha 5271

Two pairs: Belden 9842, Alpha 5272

The Pin Designations for DMX 512 are as follows:

Pin 1 Signal common (cable shield)

Pin 2 Data 1-

Pin 3 Data 1+

Pin 4 Spare, optional Data 2-

Pin 5 Spare, optional Data 2+

1 2 ... 8 9 10 11 12 13

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Leprecon Watson Bedienungsanleitung Seite 13