LSC Lighting APS - Manual (Page 19)

Clarity Operating Concepts & Terminology
Operator Manual
Page 15
5 RDM
5.1 OVERVIEW
RDM stands for Reverse Device Management. It is an “extension” to DMX.
Since the inception of DMX it has always been a ‘one way' control system. Data only ever flows
in one direction, from the lighting controller outwards to whatever it may be connected to. The
controller has no idea what it is connected to, or even if what it's connected to is working,
switched on, or even there at all!
RDM changes all that allowing the equipment to answer back and for you to remotely manage
your device.
RDM has been designed to work with existing DMX systems. It does this by interleaving its
messages with the regular DMX signal over the same wires. There is no need to change any of
your cables but because RDM messages now go in two directions, any in-line DMX processing
you have needs to be changed for new RDM hardware. This will most commonly mean that DMX
splitters and buffers will need to be upgraded to RDM capable devices.
5.2 COMMANDS
APS provides the following functions over RDM:
 Identify (blinks a message on the screen).
 Voltage, Current, Frequency and Fan speed values are provided as sensors.
 Status of each output are provided as sensors.
 Status of GPI, GPO and DMX are provided as sensors.
 Over/Under voltage events are reported as “alarms”. In RDM language these are known
as “Advisory Status Messages”.
 Manual On/Off control using either “Get/Set Lamp State” or “Get/Set Power State”
commands.
More information on RDM can be found at:
http://www.rdmprotocol.org/