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Rail-Split RDM User Guide
Application Diagram
The diagram below shows how Rail-Split RDM could be utilised in a typical application.
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
Device 1
Terminated
DMX/RDM
DMX/RDM
DMX/RDM
DMX
PSU
Rail-Split RDM
in Split Mode
Rail-Split RDM
in Fix Mode
Terminated
Devices with DMX Compatibility Issues
Terminated
Device 2
Device 3
Device 4
Device 1
3
Device 32
Device 1
Device 2
Device 3
Device 4
Device 1
3
Device 32
Device 1
Device 2
Device 3
Device 4
Device 1
3
Device 32
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.
