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Modbus interface
When the connected outdoor units are other than Super Multi u series (U series)
Wiring specifications
Item
Wire diameter
Wire type
Wire types that can be used
REQUIREMENT
REQUIREMENT
When wiring the control wiring between indoor and outdoor units/central control wiring and the control wiring between outdoor
units, use the same wire type and diameter for each line.
Using a mixture of different wire types and diameters may cause a communication error.
System diagram
Central control
device
<Other than U
series>
Outdoor unit
(Super Module
Multi i series
• Super Multi mini)
<U series>
Indoor unit *
<U series>
Remote
controller *
* The wiring specifications in the system diagram above are the same even when the indoor unit or remote controller are other
than the U series.
9-EN
LINK (Uh)
U 3 U 4
U3
U4
U 3 U 4
U4
U 1
U 2
U 5 U 6
U 1
U2
U 1
U 2
U 1 U 2
U4
U v
U v
A
B
U6
Communication line
Control wiring between indoor and outdoor units and central control
wiring
1.25 mm
(up to 1000 m)
2
2.0 mm
2
(up to 2000 m)
2-core, non-polar
Shielded wire
[Central control wiring/Control wiring between indoor
and outdoor units]
(L1+L2+L3) = Up to 2000 m
[Control wiring between indoor and outdoor units]
L4 = Up to 100 m
U 3 U 4
U 3 U 4
U3
U 2
U 5 U 6
U 1
U 2
U 5 U 6
U1
U 1 U 2
U4
U4
U v
A
B
U6
Installation Manual
U 1 U 2
U4
U v
A
B
A
B
U6
U6
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