Page 5
Rail-Split DMX User Guide
Application Diagram
The diagram below shows how Rail-Split DMX could be utilised in a typical application.
Circuit
Description
DMX512 Input
(including Loop Through)
Type:
Isolated
Pin 1:
Connects to internal isolated
circuit. No connection to
Internal Logic Ground
DMX512 Outputs
Type:
PSU referenced
Pin 1:
Connected to Internal Logic
Ground
Internal Logic Ground
Connected to power supply 0V. If the selected PSU has a connection
between Earth-Ground and 0V the DMX outputs become Ground
Referenced. Otherwise the DMX outputs are Floating. When the
recommended PSU is used, DMX outputs are Floating.
The following table summarises the internal earth interconnection and isolation.
Please note that we use the term Earth-Ground to avoid international confusion. In Europe
Earth-Ground is called Earth; in the USA, Earth-Ground is called Ground.
Internal Earth and Isolation
DMX Controller
Rail-Split DMX
DMX
DMX
DMX
DMX
PSU
Device 1
Terminated
Terminated
Terminated
Device 2
Device 3
Device 4
Device 1
3
Device 32
Device 1
Device 2
Device 3
Device 4
Device 5
Device 32
Device 1
Device 2
Device 3
Device 4
Device 5
Device 32
