Hitachi WJ200 Series

B−3
Connecting the Inverter to ModBus
Modbus connector is in control terminal block as below. Note that RJ45 connector
(RS-422) is used for external operator only.
Terminate Network Wiring - The RS-485 wiring must be terminated at each physical
end to suppress electrical reflections and help decrease transmission errors. WJ200 has
a built-in 200
Ω resistor activated by a dip switch. Select termination resistors that match
the characteristic impedance of the network cable. The diagram above shows a network
with the needed termination resistor at each end.
PLC
P24 1 L 3 2 5 4 6
SN
7
12 11 AM CM2
OI L H O EA
SP
EO
RS-485
(Modbus)
SP SN
SP SN SP SN SP SN
External device
(Master)
+-
WJ200
(
No.2
)
WJ200
(
No.3
)
WJ200
(
No.n
)
WJ200
(
No.1
)
200Ω
RS-422
(Operator)
USB
Dip switch for termination resistor