3-3. Power, Signal, and Earth Line Connections
Attach the AC adapter and 
tighten securely until the screw 
type fastener is fully fixed.Be 
sure to connect the main unit and 
the AC adapter before supplying 
power to the AC adapter.
Outdoor unit
Indoor unit
Remote controller
LINK 1
Outdoor unit
Indoor unit
Remote controller
LINK 2
RS-485 signal line
LINK1 and LINK2 
terminals do not have 
polarity
The RS-485 cable has polarity 
(A, B). It will not work correctly if 
it is connected with incorrect 
polarity.
Connect the 
shielded wire of the 
RS-485 signal line 
to the FG terminal 
block.
Connection with 
power meter 
interface/digital 
I/O interface 
(sold separately)
Power connector
(DC 12 V)
Connect the shield of the TU2C-
LINK communication line to the 
earth on the air conditioner side. 
Leave the shield open (and 
insulate it). Do not connect it to the 
terminal block.
LAN cable
Functional earth
Connect the functional ground terminal 
to the ground near the system 
controller.
For DI1 to DI8, DO1 to DO4, and each COM, use a flat head precision screwdriver 
to loosen the screws and open the insertion opening. After inserting the wiring, 
securely tighten the screws with a precision screwdriver so that the wiring cannot 
come out. After tightening, check that the wiring cannot come out.
USB port x2
LAN port
Client