Network Termination - YASKAWA T1000V Technical Manual

■ Using 4-Wire RS-422
Figure C.4
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
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
S+
S–
PLC
IG
R+
R–
Figure C.4 Wiring for RS-422
Figure C.5
DIP switch S2
OFF ON
Figure C.5 Serial Communications Terminal and DIP Switch S2
R+
Drive
R–
S+
S2
S–
IG
OFF ON
R+
Drive
R–
S+
S2
S–
IG
OFF ON
R+
Drive
R–
S+
S2
S–
IG
OFF ON
illustrates the setting of DIP switch S2.
S+
S-
RS-422A
or
R+
RS-485
R-
terminal resistance (1/2 Ω, 120 Ω)
C.4 Connecting to a Network
+
-
DIP
switch
S2
C
385