Network Termination - Omron J1000 User Manual

C.4 Connecting to a Network
n RS-422 Interface
Note: • Turn on the DIP switch at the SI-485/J that is located at the end of the network. Turn it off at all other slaves.
• Set H5-07 to "0" when using the RS-485 interface.
u

Network Termination

The two ends of the MEMOBUS/Modbus network line have to be terminated. The Interface for MEMOBUS/Modbus
Communication (SI-485/J) has a built in terminating resistance that can be enabled or disabled using DIP switch S2. If a
drive is located at the end of a network line, enable the terminating resistance by setting DIP switch S2 to the ON position.
Disable the terminating resistance on all slaves that are not located at the network line end.
of DIP switch S2.
190
S+
S–
PLC
IG
R+
R–
Figure C.4 RS-422 Interface
DIP switch S2
(in the ON position)
OFF ON
Figure C.5 Serial Communications Terminal and DIP Switch S2
Drive
R+
SI-485/J
R–
S2
IG
S+
Terminating
S–
Register
OFF
Drive
R+
SI-485/J
R–
S2
IG
S+
Terminating
S–
Register
OFF
Drive
R+
SI-485/J
R–
S2
IG
S+
Terminating
S–
Register
ON
S+
S -
RS-422
or
RS-485 R+
DIP
switch
R -
S2
terminal resistance (1/2 W, 110
SIEP C710606 33A OYMC AC Drive – J1000 User Manual
Figure C.5 llustrates the setting
+
-
)