ETC Unison ERn Rack-mount Control Enclosure - Manual (Page 24)

20 Unison ® ERn Rack Mount Enclosure Installation Manual
Right I/O Board Terminations
The right I/O board is located inside the ERn enclosure and serves are the connection point
for option kits, power supplies, and data terminations.
The “24 Vdc in” connection is the rack power supply (ERn-PS) connection and is connected
for you at the factory. The “ERn-RPS” and “Ride Thru / Batt” terminations are detailed in
“Rack Options” on page 22 .
Terminate DMX
DMX requires 120  termination at the last DMX device in the control run. Since an ERn
with a Paradigm module installed can utilize up to two DMX inputs (2 DMX runs) the right
I/O board provides convenient termination switches for use.
Notice the two termination switches labeled DMXA and DMXB on the right I/O board. Each
switch has three termination positions:
• Source - reserved for RDM termination (future
development).
• Off - no termination, DMX will pass through this
devices on to the next DMX device in the data
run.
• End - termination is on. Used for the last DMX
device (ERn enclosure) that is physically
connected in the daisy chained DMX data run.
If DMXB is configured to output DMX, the
termination for DMXB should be switched to “OFF”.
24V In
RPS In
CDI
LON
DMX B
DMX A
Ride Thr u/Batt
connection to rear panel I/O
connection to
rear panel I/O
ERn-RPS In
Ride Thru / Batt
24Vdc In
Ride Thru
/Batt
CDI port LON
Full
Half
DMXA
DMXB
SRC Off End
connection to
rear panel I/O