D.C. Inverter Multi-variable Modular
33
4.7 Connection Method and Steps for System Communication
4.7.1 Communication connection between IDU and ODU
NOTE:The centralized controller can be installed when it is necessary.
Connect IDU and ODU via terminal D1/D2 of wiring board XT2. Below are the connection
graphics of single unit and modular units:
D1 D2
2
2
NO.1
NO.2
…
NO.n,(80max)
D1 D2
H1 H2
X T2
MODBUS
GATEWAY
G1G2
X T2
1 2
ON
SA8
D1
D2
H1 H2
D1 D2
H1 H2
D1
D2
H1 H2
ODU
IDU
IDU
IDU
IDU
IDU
Communication within IDUs
MODBUS or
BACnet gateway
Prev. IDU
Next IDU
Communication
matched resistance
Wired controller
Connect with the
outdoor module
The gateway is
available when
central controlling
is required.
Fig.44 Connection of single unit
NO.1
NO.2
NO.n,(80max)
D1 D2 G1G2
2
2
…
1 2
ON
SA8
1 2
ON
SA8
D1 D2 G1G2
D1 D2 G1G2
1 2
ON
SA8
MODBUS
GATEWAY
IDU
IDU
IDU
Communication within IDUs
MODBUS or
BACnet gateway
X T2
D1 D2
H1 H2
D1
D2
H1 H2
IDU
Next IDU
D1 D2
H1 H2
X T2 D1 D2 H1 H2
IDU
Prev. IDU
Communication
matched resistance
Wired controller
ODU 3 (slave unit)
ODU 2 (slave unit)
ODU 1 (master unit)
Connect with the
last slave
module
The gateway is
available when
central controlling
is required.
Fig.45 Connection of modular units
