Installation User guide
Installation, cont’d
MLC 226 IP Series • Installation
2-16
PRELIMINARY
Pinout Guide
The illustration below summarizes the pin assignments of all of the MLC’s bottom 
panel connectors that are covered in detail on pages 2-5 to 2-14.
A B C D E
DISPLAY
RS-232/IR RS-232 12V
CM/IR/SCP
A B C D E
MLS    PWR
AB
Tx/IR
Rx
GROUND
PWR SN S
GROUND
+12V OUT
Rx
Tx
GROUND
GROUND
+12V IN
+12V OUT
GROUND
CONT MOD
IR IN
SCP COM
NORMALLY OPEN
1 2
COMMON
COMMON
COMMON
GROUND
Tx/IR
Tx/IR
Tx/IR
GROUND
GROUND
A
RELAYS
IR/SERIAL OUT
3  4
B
5 6
CA BC
MLC 226 IP 
Bottom Panel
Common 
Relay 1 
Relay 2 
To / from control equipment 
(screen control motors, lights, etc.) 
Ground ( ) 
Transmit (Tx) 
Receive (Rx) 
To an optional Extron switcher 
From an external 12 VDC, 1 A (max.) power supply 
Ground ( ) 
Receive (Rx) 
Transmit (Tx) 
To a projector or display 
To an Extron 
Display
Power Sensor
OR 
+12 VDC 
Ground ( ) 
Power sense 
To an IR Emitter, IR Broadcaster, 
or IR or serial (RS-232) controllable device 
Ground ( ) 
+12 VDC input 
SCP communication (IR) 
Modulated IR (for IR Link or IRL 20)
Ground ( ) 
IRCM, ACM, RCM 
+12 VDC 
Digital
input 
Ground 
Signal (IR) 
To / from optional Extron 
control modules, IR Link IR 
repeater, or SCP control pads
Mounting the MLC
Once the system has been cabled, confi gured (see chapter 4), and tested, the 
controller can be installed in the wall, furniture, equipment rack, or Euro Channel.
DISPLAY 
MLC 226 IP 
1 
2 
3 
4 
5 
6 
VOLUME 
CONFIG 
IR 
ON 
OFF 
PIC
MUTE
LIGHT
OFF
DOC
CAM
VCR 
DVD 
LAPTOP
PC
AUTO
IMAGE
2 
1 
2 
1 
2 
1 
2 
1 
a
  Mounting screws (4) — Use these to attach the MLC to a wall, furniture, or 
other mounting surface.
b
  Faceplate attachment screws (4) — Do not remove these screws during or 
after mounting. They attach the faceplate to the MLC unit. Removing these 
screws during or after mounting will cause the MLC to detach, and it may 
then fall down into the wall or furniture.










