Martin MAC 250+ Bedienungsanleitung PDF herunterladen (Seite 7)

Setup

Tips for building a serial link

• Use shielded twisted-pair cable designed for RS-485 devices: standard microphone cable cannot transmit DMX data

reliably over long runs. For links up to 300 meters (1000 ft.) long, you can use 24 AWG, low capacitance, 85-150 ohm

characteristic impedance, shielded cable with 1 or more twisted pairs. For runs up to 500 meters (1640 ft.) use 22 AWG

cable. Use an amplifier if the serial link exceeds 500 meters.

• Never use a “Y” connector to split the link. To split the serial link into branches use a splitter such as the Martin 4-

Channel Opto-Isolated RS-485 Splitter/Amplifier.

• Do not overload the link. Up to 32 devices may be connected on a serial link.

• Terminate the link by installing a termination plug in the output socket of the last fixture on the link. The termination

plug, which is simply a male XLR connector with a 120 ohm, 0.25 watt resistor soldered between pins 2 and 3, “soaks

up” the control signal so it does not reflect back down the link and cause interference. If a splitter is used, terminate

each branch of the link.

1 2 3 4 5 6 7 8 9 10 11 12 ... 29 30

Keine Kommentare

Martin MAC 250+ Bedienungsanleitung Seite 7