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Modbus interface
Modbus-Master
(Locally procured)
A
B
(+)
(-)
The shielded wire of the RS-485
communication cable must be earthed
on address 1
CAUTION: RS-485 communication
cables A(+) and B(-) have polarity.
Be careful when connecting the RS-
485 wires.
7-EN
Do not connect the shielded wire of
Uh Line communication cable to the
earth.
LINK(Uh) U3 and
U4 have no polarity.
RS-485 terminator resistor is set by
Modbus interface of address setting
switch SW1=1 only.
Set the RS-485 terminator resistor on the
address1 unit (Modbus interface address
SW1=1) and host system. Do not set it here.
Uh Line terminator resistor is set on
SW1
the air conditioner side. SW6 should
be OFF.
4
SW5
SW6
U4 U3
U2 U1
U2 U1
SW1
1
SW5
SW6
U4 U3
U2 U1
U2 U1
Set the Modbus interface address with SW1. Assign 1 to
F(15) to each address to avoid duplication.
CAUTION: The SW1 setting is read when the power is
turned on. Push the reset switch SW7 after changing the
address.
Installation Manual
U4 U3
U4 U3
U2 U1
U2 U1
U2 U1
U4 U3
U4 U3
U2 U1
U2 U1
U2 U1
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