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10. DMX512 Connection
1. If you usign a controller with 5 pins DMX output, you need to use a 5 to 3 pin
adapter-cable.
2. At last unit, the DMX cable has be terminated with a terminator. Solder a
120ohm 1/4W resistor between pin 2(DMX - ) and pin 3(DMX +) into a 3-pin
XLR-plug and plug it in the DMX-output of the last unit.
3. Connect the unit together in a daisy chain by XLR plug from the output of the
unit to the input of the next unit. The cable can not branched or split to a ‘Y’
cable. DMX512 is a very high-speed signal. Inadequate or damaged cables,
soldered joints or corroded conectors can easily distort the signal and shut
down the system.
4. The DMX output and input connectors are pass-through to maintain the DMX
circuit, when one of the units power is disconnected.
5. Each lighting unit needs to have an address set to receive the data sent by the
controller. The address numer is between 0-511 (usualy 0 & 1 are equal to 1).
6. The end of the DMX512 system should be terminated to reduce signal errors.
7. 3 pin XLR connector are more popular than 5 pin XLR
3 pin XLR: Pin 1: GND, Pin 2: Negative signal (-), Pin 3: Positive signal (+)
5 pin XLR: Pin 1: GND, Pin 2: Negative signal (-), Pin 3: Positive signal (+),
Pin 4/Pin 5: not used
11. Troubleshooting
Following are a few common problems that may occur during operation. Hear are
some suggestions for easy troubleshooting.
A. The unit does not work, no light and the fan does not work.
•
Check the connection of power and main fuse
•
Measure the mains voltage on the main connector
•
Check the power on LED
B. Not responding to DMX controller
•
DMX LED should be on. If not, check DMX connectors, cables to see if
link properly
•
If the DMX LED is on and no response to the channel, check the
address setting and DMX polarity.
•
If you have intermittent DMX signal problems, check the pins on
connectors or on PCB of the unit or the previous one.
•
Tryt to us another DMX controller
•
Check if the DMX cables run near or run alongside to high voltage
cables that may cause damage or interference to DMX interface circuit.
C. Some units don’t’s respond to the easy controller
