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7
Basics
Signal transmission
Cabling
This chapter provides basic information about the data transmission using the DMX protocol.
DMX signals are generated by a DMX controller. The signals are transferred over a DMX cable
to the connected devices. Each connection can transmit up to 512 channels. For each channel,
a value between 0 and 255 is being transmitted. The 512 channels form a so-called 'DMX uni‐
verse'.
DMX devices are connected serially, that means the sending device transmits signals to all con‐
nected receivers (daisy chain). The order of the receivers in the daisy chain does not matter
since all devices filter and process the relevant data independently from each other.
To create the daisy chain, the DMX input of the first receiver is connected to the DMX output of
the controller or another DMX master. The output of the first receiver is connected to the input
of the second one, and so on. The output of the last receiver in the DMX chain must be termi‐
nated using a resistor (110 Ω, ¼ W).
Basics
DMX DC-192
25
DMX controller
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