Network Termination - YASKAWA A1000 HHP Programming Manual

n RS-485 Interface
Note: 1. Turn on the DIP switch on the drive that is located at the end of the network. All other slave devices must have this DIP switch set to
the OFF position.
2. Set H5-07 to 1 when using the RS-485 interface.
n 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 termination resistor that
can be enabled or disabled using DIP switch S2. If a drive is located at the end of a network line, enable the termination resistor
by setting DIP switch S2 to the ON position. Disable the termination resistor on all slaves that are not located at the network
line end.
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
R– S–
Drive
R+ S+
PLC
S– R–
S2
S+ R+
IG IG
OFF
S– Drive
S+
R–
S2
R+
IG
OFF
S–
Drive
S+
R–
S2
R+
ON
IG
Figure B.3 RS-485 Interface
R – S –
Drive
R+ S+
PLC
S – R –
S2
S+ R+
OFF
IG IG
S –
Drive
S+
R –
S2
R+
IG
OFF
S –
Drive
S+
R –
S2
R+
ON
IG
Figure B.4 RS-422 Interface
B.3 Connecting to a Network
B
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