Wiring And Arrangement Of Rs-485 Terminals - Mitsubishi Electric FR-F740-00023 Instruction Manual

4.19.2 Wiring and arrangement of RS-485 terminals

(1) RS-485 terminal layout
OPEN
Terminating resistor switch
Factory-set to "OPEN".
Set only the terminating resistor switch of
the remotest inverter to the "100Ω" position.
100Ω
RDA1 RDB1 RDA2 RDB2
(RXD1+) (RXD1-) (RXD2+) (RXD2-)
SDA1 SDB1 SDA2 SDB2
TXD
(TXD1+) (TXD1-) (TXD2+) (TXD2-)
P5S SG P5S SG
(VCC) (GND) (VCC) (GND)
(2) Connection of RS-485 terminals and wires
Loosen the terminal screw and insert the cable into the terminal.
Screw size M2
Tightening
0.22N••m to 0.25N••m
torque
Cable size 2
0.3mm
Small
Screwdriver
(Tip thickness: 0.4mm /tip width: 2.5mm)
CAUTION
Undertightening can cause signal loss or malfunction. Overtightening can cause a short circuit or malfunction due to damage to
the screw or unit.
RXD
VCC
2
to 0.75mm
flathead screwdriver
Communication operation and setting
Name
RDA1
(RXD1+)
RDB1
(RXD1-)
RDA2
(RXD2+)
RDB2
(RXD2-)
SDA1
(TXD1+)
SDB1
(TXD1-)
SDA2
(TXD2+)
SDB2
(TXD2-)
P5S
(VCC) Permissible load current 100mA
SG
(GND)
Wire the stripped cable after twisting it to prevent it from
becoming loose. In addition, do not solder it.
5mm
Use a blade terminal as necessary.
Description
Inverter receive+
Inverter receive-
Inverter receive+
(for branch)
Inverter receive-
(for branch)
Inverter send+
Inverter send-
Inverter send+
(for branch)
Inverter send-
(for branch)
5V
Earth
(connected to terminal SD)
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