Lightronics RE121D - Manual (Page 3)

Page 3 of 8
RE - 121 RACK MOUNT DIMMER
Revision 2.1
OWNERS MANUAL 11/29/2007
www.lightronics.com
Lightronics 509 Central Drive, Virginia Beach, VA 23454 (757) 486-3588
POWER CONNECTIONS
Power enters the RE-121 through the rear of the unit via a hole sized for 1" conduit. Inside the RE-121 is a
terminal block with three lugs. The "H1" and "H2" are the line connections or "hots". The center connection
labeled "N" is the neutral. There is an additional ground lug labeled "G" located near the terminal block. This lug
is for connecting the chassis to earth ground.
Consult your local electrical codes to determine the proper wire type and wiring methods for your installation.
Connect a ground wire to the ground lug "G" first. Next connect the neutral to the center lug "N" on the terminal
block, then connect one hot to the lug of the terminal block marked "H1"and the other hot to the "H2" lug of the
terminal block.
CONTROL SIGNALS
The RE-121 is supplied to use one of two types of control signal. Either DMX-512 control or LMX-128 control is
supplied when ordered. The front panel is marked to show which protocol can be used.
DMX CONTROL
The DMX-512 control signal enters the RE-121 through a 5 pin "XLR" connector on the rear of the unit. A
second connector (5 pin female XLR) is used to continue this control signal out to other dimmers in the system.
Normally the male connector is used for the incoming control signal and the female connector is used to loop out
to other dimmers. These connectors are wired in parallel so either connector may be used as input or output.
The table below shows the control signal connector pin assignments.
LMX CONTROL
The LMX-128 control signal enters the RE-121 through a 3 pin "XLR" connector on the rear of the unit. A
second connector (3 pin female XLR) is used to continue this control signal out to other dimmers in the system.
Normally the male connector is used for the incoming control signal and the female connector is used to loop out
to other dimmers. These connectors are wired in parallel so either connector may be used as input or output.
The table below shows the control signal connector pin assignments.
Connector
Pin #
Signal Name
1 DMX Common
2 DMX Data -
3 DMX Data +
4 Not Used
5 Not Used
Connector
Pin #
Signal Name
1 LMX Common
2 Console Power (+15VDC)
3 LMX Signal
WARNING
MAKE CERTAIN POWER IS REMOVED FROM THE FEED CIRCUITS
BEFORE YOU BEGIN INSTALLATION.