ETC Cobalt Family v7.0.0 - Manual (Page 160)

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RDM
This checkbox enables and disables RDM on the DMX ports. These default to disabled. Click in the
check box to enable RDM communication on each port.
Note: RDM communication can cause older or non-RDM compliant devices to misbehave
(flicker/twitch, depending on the type of device and how the RDM on the DMX line manifests itself.)
It is recommended that you keep older equipment on a separate DMX line from devices that can
communicate over RDM to avoid undesired fixture behaviors.
DMX Input mode
You can activate DMX input for one DMX universe (selectable) though an ETC node from an EDMX
or sACN universe and map it to a channel which will be the start channel for that universe. When
DMX input is activated, master playback 20 will act as a master for the DMX input.