Wiring And Configuration Of Rs-485 Terminals; Rs-485 Terminal Layout; Connection Of Rs-485 Terminals And Wires - Mitsubishi FR-A800 Instruction Manual

5.15.2

Wiring and configuration of RS-485 terminals

RS-485 terminal layout
Terminating resistor switch
Initially-set to "OPEN".
Set only the terminating resistor switch of
the remotest inverter to the "100Ω" position.
P5S SG SDA1
(VCC) (GND) (TXD1+)
OPEN
VCC GND + TXD
100Ω
VCC GND + TXD
P5S SG SDA2
(VCC) (GND) (TXD2+)
Connection of RS-485 terminals and wires
• The size of RS-485 terminal block is the same as the control circuit terminal block.Refer to
NOTE
• To avoid malfunction, keep the RS-485 terminal wires away from the control circuit board.
• When the FR-A820-01250(22K) or lower, or the FR-A840-00620(22K) or lower is used with a plug-in option, lead the wires
through the hole on the side face of the front cover for wiring of the RS-485 terminals.
Cut off with
a nipper, etc.
• When the FR-A820-01540(30K) of higher, or the FR-A840-00770(30K) or higher is used with a plug-in option, lead the wires
on the left side of the plug-in option for wiring of the RS-485 terminals.
SDB1 RDA1 RDB1
(TXD1-) (RXD1+) (RXD1-)
- + RXD -
- + RXD -
SDB2 RDA2 RDB2
(TXD2-) (RXD2+) (RXD2-)
(N) Operation via communication and its settings
Name
RDA1
(RXD1+)
RDB1
(RXD1-)
RDA2
(RXD2+)
RDB2
(RXD2-)
SDA1
(TXD1+)
SDB1
(TXD1-)
SDA2
(TXD2+)
SDB2
(TXD2-)
P5S
(VCC)
SG
(GND)
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
Permissible load current 100 mA
Earthing (grounding)
(connected to terminal SD)
page 51 for the wiring method.
PARAMETERS
5
GROUP
N
557