Doug Fleenor Design DMX512 소유자 매뉴얼 - 페이지 5

{카테고리_이름} Doug Fleenor Design DMX512에 대한 소유자 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Doug Fleenor Design DMX512 6 페이지. Dmx512 to 0-10 volt analog converter

Remove the four screws that secure the top panel and remove the panel.

The jumper is labeled "

Remove the jumper.

Replace the top panel and secure with the four screws.

The DMX512 to Analog Converter has a built in test mode which allows the outputs to

be brought up to full without any DMX512 input. To bring up a particular channel set

the starting address switch for 6XX where XX is the channel to be brought to full. For

example: To bring channel 1 to full, set the switch to 601. To bring channel 24 to full

set the switch to 624.

Test mode is useful for testing lamps and focusing. When in test mode, the signal LED

will flash to warn the user that the unit is not using the DMX512 input to set the levels.

For those technical types out there, here is a brief description of how the DMX to

Analog Converter works.

DMX512 uses a "differential" digital signal. A differential signal is a pair of signals

which are inverse from one another. That is, when one is high, the other is low.

Differential signals are common in both analog processing (balanced microphone

cables) and digital processing (digital communications such as EIA-485). Differential

signals are used to reduce the effect of electrical noise on long cable runs. When a

differential signal is processed by the receiving circuit (microphone pre-amp or EIA-485

receiver for example) the noise can be eliminated but the signal remains.

Differential signals always travel in pairs, and the wires on which they travel are usually

twisted to insure any noise picked up is of equal magnitude on both wires. The noise

must be of equal magnitude on each wire so that the receiving circuit can effectively

subtract the noise and leave the signal. The pairs of signals are usually denoted by a

plus (+) sign on the normal, or "hot", or "true" line and by a minus (-) sign on the

inverted, or "return", or "complement" line. The differential signals on the combine unit

are Data+ and Data-.

DMX512 is a standard for lighting control published by the United States Institute For

Theater Technology. The DMX512 standard specifies that the electrical properties of

the signal comply with a standard published by the Electronic Industries Association,

EIA-485 (or RS-485). Many manufacturers make integrated circuits that meet the input

and output specification of EIA-485. The DMX512 to 0-10 Volt Analog Converter uses

the "75179" as its receiver. The "75179" was designed specifically to meet EIA-485.

The DMX512 signals from the console are applied to the input connector of the

Converter. These are received by "75179" and fed to an optical isolator. The signal is

passed through the isolator and on to an 80C31 micro-controller. The micro-controller

receives the digital signal, selects the DMX channels required based on the setting of

the starting address switch and sends these levels to a Digital to Analog converter chip

REMOVE JUMPER TO BLACK-OUT ON LOSS OF SIGNAL

TEST MODE