Martin MAC 101 Series Manual de usuario descargar pdf (Pagina 10)

10 MAC 250 Krypton

3 To terminate the link, insert a male 120 Ω XLR termination plug in the output of the last fixture.

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.

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Martin MAC 101 Series Manual de usuario Pagina 10