C.4 Connecting to a Network
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 385
MEMOBUS/Modbus
Communications
C
■ Using 4-Wire RS-422
Figure C.4
Figure C.4 Wiring for RS-422
Note: 1. Make sure the terminal resistor is switched on for the final drive in the comm. chain.
2. Set drive parameter H5-07 = 0 when using RS-422.
◆ Network Termination
The two ends of the MEMOBUS/Modbus network line have to be terminated. The drive 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. Figure C.5 illustrates the setting of DIP switch S2.
Figure C.5
Figure C.5 Serial Communications Terminal and DIP Switch S2
R+
R–
IG
S+
S–
PLC
Drive
S2
OFF ON
R+
R–
IG
S+
S–
Drive
S2
OFF ON
R+
R–
IG
S+
S–
Drive
S2
OFF ON
R+
R–
IG
S+
S–
+
-
R+
S+
S
-
R
-
RS-422A
or
RS-485
switch
S2
DIP
terminal resistance (1/2 Ω, 120 Ω)
OFF ON
DIP switch S2
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