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(4) RS-485 terminal wiring method
Wiring of one RS-485 computer and one inverter
Wiring of one RS-485 computer and "n" inverters (several inverters)
Computer
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
*1
Make connections in accordance with the manual of the computer used.
Fully check the terminal numbers of the computer since they change with the model.
*2
For the inverter farthest from the computer, set the terminating resistor switch to ON (100
REMARKS
For branching, connect the wires as shown below.
To computer send
To computer receive
To computer ground
(5) 2-wire type connection
If the computer is 2-wire type, pass wires across receiving terminals and transmission terminals of the RS-485
terminals to enable 2-wire type connection with the inverter.
REMARKS
A program should be created so that transmission is disabled (receiving state) when the computer is not sending and reception is
disabled (sending state) during sending to prevent the computer from receiving its own data.
Computer
RDA
RDB
SDA
SDB
RSA
RSB
CSA
CSB
SG
FG
*1
SG
SG
Station 0
- -
-
+ +
+ +
RXD
+ - + -
+ - +
TXD
SG
SG
VCC
Computer
Transmission
enable
Reception
enable
SG
Communication operation and setting
*2
*1
SG
SG
SG
Station 1
+ - +
-
+ -
+
RXD
To receiving terminal
of the next inverter
+ - + -
+ - +
TXD
To receiving terminal
of the next inverter
SG
SG
VCC
To next inverter
To earth terminal
Inverter
TXD+
TXD-
RXD+
RXD-
Pass a wire
SG
*2
SG
Station n
side).
4
193

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