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DMX-512 connection with DMX terminator
For installations where the DMX cable has to run a long distance or is in an electrically noisy environment,
such as in a discotheque, it is recommended to use a DMX terminator. This helps in preventing corruption of
the digital control signal by electrical noise. The DMX terminator is simply an XLR plug with a 120
Ω
resistor
connected between pins 2 and 3,which is then plugged into the output XLR socket of the last fixture in the
chain. Please see illustrations below.
Projector DMX start address selection
All fixtures should be given a DMX starting address when using a DMX signal, so that the correct fixture
responds to the correct control signals. This digital starting address is the channel number from which the
fixture starts to “listen” to the digital control information sent out from the DMX controller. The allocation of
this starting address is achieved by setting the correct number on the display located on the base of the device.
You can set the same starting address for all fixtures or a group of fixtures, or make different address for each
fixture individually.
If you set the same address, all the units will start to “listen” to the same control signal from the same channel
number. In other words, changing the settings of one channel will affect all the fixtures simultaneously.
If you set a different address, each unit will start to “listen” to the channel number you have set, based on the
quantity of control channels of the unit. That means changing the settings of one channel will affect only the
selected fixture.
In the case of the move head, which is a 2 channel fixture, you should set the starting address of the first unit to
1, the second unit to 3 (2 + 1), the third to 5 (2 + 3), and so on.
Address 1 Address 3 Address5
