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Communication operation and setting
4
PARAMETERS
(3) Connection with RS-485 computer
Wiring of one RS-485 computer and one drive unit
Wiring of one RS-485 computer and "n" (multiple) drive units
Make connection in accordance with the instruction manual of the computer to be used with.
Fully check the terminal numbers of the computer since they vary with the model.
The drive units may be affected by reflection depending on the transmission speed or transmission distance. If this reflection hinders communication,
provide a terminating resistor. If the PU connector is used to make a connection, use a distributor since a terminating resistor cannot be fitted. Connect the
terminating resistor to only the drive unit remotest from the computer. (Terminating resistor: 100)
(4) Two-wire type connection
If the computer is 2-wire type, a connection from the drive unit can be changed to 2-wire type by passing wires across
reception terminals and transmission terminals of the PU connector pin.
NOTE
Do not use pins No. 2, 8 of the communication cable. (Refer to page 201)
When making RS-485 communication with a combination of the FR-E700EX series, FR-E500 series, and FR-S500
series, incorrect connection of pins No.2 and 8 (parameter unit power supply) of the above PU connector may result
in a malfunction or failure of the inverter or drive unit.
(Refer to page 201)
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.
The passed wiring length should be as short as possible.
Computer side terminals
Send data RDB
Send data RDA
Receive data SDB
Receive data SDA
PU connector
Signal ground SG
Drive unit
∗1
0.2mm
2
or more
Cable connection and signal direction
Communication cable
SG
∗1
∗2
Computer
Drive unit
Station 1
SG
RDB
RDA
SDB
SDA
Drive unit
Station 2
SG
RDB
RDA
SDB
SDA
Drive unit
Station n
SG
RDB
RDA
SDB
SDA
Terminating
resistor
Cable connection and signal direction
Communication cable
Send
Receive
SDA
SDB
RDA
RDB
SG
SG
Drive unitComputer
Pass a wire
Transmission enable
Reception enable