84
SPECIFICATIONS
(4) RS-485 terminal system configuration
Use the RS-485 terminals to perform communication
operation from a personal computer etc. When the
PU connector is connected with a personal, FA or
other computer by a communication cable, a user
program can run and monitor the inverter or read and
write to parameters.
1) Connection of a computer to the inverter (1:1
connection)
2) Combination of computer and multiple inverters
(1:n connection)
(5) RS-485 terminal wiring method
1) Wiring of one RS-485 computer and one inverter
2) Wiring of one RS-485 computer and n (multiple)
inverters
*1
Make connection in accordance with the instruction
manual of the computer. Check the terminal numbers of
the computer since terminal number differs with the
model.
*2
For the inverter farthest from the computer, set the
terminating resistor switch to ON (100
Ω
position).
*3
For branching, connect the wires as shown below.
(6) Two-wire type connection
If the computer is 2-wire type, a connection from the
inverter can be changed to 2-wire type by passing
wires across reception terminals and transmission
terminals of the RS-485 terminal.
A program should be created so that transmission is
disabled (receiving state) when the computer is not
sending and receiving is disabled (sending state)
during sending to prevent the computer from
receiving its own data.
* Set the terminating resistor switch to the 100
Ω
position.
* Set only the terminating resistor switch of the
remotest inverter to the 100
Ω
position.
common
Computer
Twisted pair cable
Twisted pair cable
*Set the terminating resistor switch to the "100
Ω
" position.
Inverter
RS-485
terminals
*
Computer
Converter
RS-232C
cable
Inverter
RS-485
terminals
*
RS-485
interface/
terminals
Maximum
15m
Computer
Twisted pair cable
Twisted pair cable
RS-485
interface terminals
Inverter
RS-485
terminals
*
Inverter
RS-485
terminals
*
Inverter
RS-485
terminals
*
Station 0
Station 1
Station n
Computer
RS-232C
converter
RS-232C
cable
Maximum
15m
Converter
Inverter
Inverter
Inverter
Station 0
Station 1
Station n
RS-485
terminals
*
RS-485
terminals
*
RS-485
terminals
*
common
*1
Computer
RDA
RDB
SDA
SDB
RSA
SG
RSB
CSA
CSB
FG
SG
*2
-
+
-
+
SDB1
SDA1
RDB1
RDA1
*1
Computer
RDA
RDB
SDA
SDB
RSA
SG
RSB
CSA
CSB
FG
Station 0
SG
SG
-
+ -
+
-
+ -
+
Station 1
SG
SG
-
+
+
-
-
+
+
-
Station n
SG
*2
-
+
SDB1
SDA1
RDB1
RDA1
RDA2
RDB2
SDA2
SDB2
SDB1
SDA1
RDB1
RDA1
SDB1
SDA1
RDB1
RDA1
RDA2
RDB2
SDA2
SDB2
-
+
To computer send
To computer receive
To computer ground
TXD
RXD
VCC
RXD
VCC
TXD
SG
SG
SG
SG
+
-
+
-
+
-
+
-
+
-
+
+
+
+
+
+
-
--
+
-
+
-
+
+
-
+
-
To receiving terminal
of the next inverter
To receiving terminal
of the next inverter
To next inverter
To earth (ground)
terminal
common
TXD+
TXD-
RXD+
RXD-
SG
SG
Inverter
Computer
Pass a wire
Transmission
enable
Receiving
enable
Содержание FR-A700 Series
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