Wiring And Arrangement Of Rs-485 Terminals - Mitsubishi Electric FR-A740-00023 Instruction Manual

4.24.2 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
100Ω the remotest inverter to the "100Ω" position.
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
flat-blade 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.
Cable stripping size
Use a bar 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 (Ground)
(connected to terminal SD)
5mm
317
4