LSC Lighting Delta 3RU - Manual (Page 5)

LSC Lighting Systems (Aust) Pty Ltd. Page 4
Delta 3RU operator manual
3.0 Operation
The Delta 3RU power/DMX splitters have been designed for quick and easy operation. A
brief operational instruction is detailed below.
1. Switch all MCB’s to the “off” position. Confirm the RCD Master switch is switched to the
“on” position. Make the required connections to the power output connectors.
2. Connect the Delta 3RU to a suitable power source and apply power. The “Power
available“ and “DMX power” indicators will illuminate. If the “Neutral fault” or “Earth
fault” indicators illuminate, immediately remove power and check the power source.
3. Individual MCB’s can now be switched to “on” as required.
4. For the DMX equipped models, connect a DMX source cable into the DMX input
connector of the Delta 3RU. The “DMX data” light will illuminate if DMX data is present.
5. If the splitter is to be the last device at the end of the DMX cable, then press the
termination button. The “DMX terminate” indicator light will now illuminate.
6. Connect the required DMX output cable/s to the DMX output connectors at the back of
the chassis.
7. DMX data present at the DMX input connector is now internally routed to all five DMX
output connectors.
4.0 DMX Cable selection
The performance of any DMX network is directly related to the quality of cable chosen to
convey the DMX information. DMX512 has a moderate data transmission rate of 250
Kbits/s, and therefore requires selection of a cable that does not significantly distort the signal
or give rise to signal reflections.
Typical characteristics for a good DMX network cable include;
• Twisted pair with Nominal impedance of 100-120 ohms.
• low capacitance.
• Fully encased with braid and foil shielding.
• Conforms to EIA 485 requirements
.
Cables used with audio systems are not suitable for DMX512 networks as they typically have
higher capacitance, incorrect characteristic impedance and minimal shielding. At DMX512
data rates this can cause bit time distortion and signal reflections/overshoot.