Network Termination - YASKAWA V1000 Technical Manual

C.4 Connecting to a Network
n RS-422 Interface
Note: 1. Turn on DIP switch S2 on the drive located at the end of the network. Turn it off at all other slaves.
2. Set H5-07 to 0 when using the RS-422 interface.
u

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.
408
Figure C.4 RS-422 Interface
Figure C.5 illustrates the setting of DIP switch S2.
DIP switch S2
(in the ON position)
OFF
R+ R－ S+ S－ IG
P1 P2 PC A1 A2 +V AC AM AC MP
MA MB MC
S1 S2 S3 S4 S5 S6 S7 HC SC H1 RP
R+ R- S+ S- IG
Figure C.5 Serial Communications Terminal and DIP Switch S2
S+ R+
Drive
S–
R–
PLC
IG
S+
S2
R+ S–
IG
R–
OFF ON
R+
Drive
R–
S+
S2
S–
IG
OFF ON
R+
Drive
R–
S+
S2
S–
IG
OFF ON
ON
RS-422A
or
RS-485
terminal resistance (1/2 W, 120 )
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
S+
+
-
S-
R+
DIP
switch
R-
S2