elektraLite MM 150 - Manual (Page 6)

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DMX-512 Control Connection
Connect the provided XLR cable to the female 3-pin XLR output of your Elektralite CP10xt or other DMX
controller. The other end should be connected to the male 3-pin XLR input of MM150. Then daisy-chain out of
the first MM150 and into the next MM150. Never “Y” split the DMX connection.
If you need more cable, then it should be two core, screened cable fitted with a 3 pin XLR input and output
connector. Please refer to the diagram below.
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, it is
recommended that a DMX terminator is used. This helps prevent corruption of the digital control signal. The
DMX terminator is simply a 3 pin XLR plug (male) with a 120 Ω resistor connected between pins 2 and 3. It is
then plugged into the output XLR socket of the last MM150 in the chain. Please see illustration below.
Projector DMX start address selection
All MM150s need be given a DMX starting address when using a DMX signal, so that the correct MM150
responds to the correct control signals. This digital starting address is the channel number from which MM150
starts to “listen” to the digital control information sent out from the Elektralite CP10xt or other DMX controller.
The allocation of this starting address is done by setting the correct number on the display located on the base
of MM150.
You can set the same starting address for all fixtures or group of fixtures, like all the MM150s in your plot, or
you can make different address for each individual fixture.
If you set the same address, all the fixtures 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 fixture. That means changing the settings of one channel will affect only the
selected fixture.
In the case of this MM150, which is an 8 channel fixture, you should set the starting address of the first unit to 1,
the second MM150 to 9 (8 + 1), the third to 17 (16 + 1), and so on.
Note:
After switching on, MM150 will automatically detect whether DMX 512 data is received or not. If the data is received, the display will show
"A.001"
or whatever the address is set to, like “A.017” If there is no data received at the DMX-input, the display flashes "A001" or
whatever the actually set address is. The important thing to remember is the address is flashing. Now this situation can occur if:
- the 3 PIN XLR plug (cable with DMX signal from the controller) is not connected to the input of MM150.
or
- the controller is switched off or defective.
or
- if the cable or connector is defective
or
- if the signal wires are swap in the input connector. In others words, pins 1, 2 and/or 3 are not the same at both ends. Believe it or
not this is very easy to do if the person making the cable does not look at the pin numbers in the connector. The numbers of the
pins and the color of the cable need to match. Don’t just “look” at the cable and assume they are correct!
Also Note: If the lamp is on, then the display will show "A00.1" or whatever the actually address is set to. If the lamp is off, then the
display will show "A001". Note the PERIOD!