Mitsubishi Electric FR-F800 Series Instruction Manual page 498

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5.12.2 Wiring and configuration of RS-485 terminals
 RS-485 terminal layout
P5S
(VCC)
OPEN
VCC GND
VCC GND
100Ω
P5S
(VCC)
Name
RDA1 (RXD1+)
RDB1 (RXD1-)
RDA2 (RXD2+)
RDB2 (RXD2-)
SDA1 (TXD1+)
SDB1 (TXD1-)
SDA2 (TXD2+)
SDB2 (TXD2-)
P5S (VCC)
SG (GND)
 Wiring the RS-485 terminals
• The size of RS-485 terminal block is the same as that of the control circuit terminal block. Refer to
method.
NOTE
• To avoid malfunction, keep the RS-485 terminal wires away from the control circuit board.
• When the FR-F820-01250(30K) or lower, or the FR-F840-00620(30K) 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.
• When the FR-F820-01540(37K) of higher, or the FR-F840-00770(37K) 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.
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Do not use pins No. 2 and 8 of the communication cable.
Terminating resistor switch
Initially-set to "OPEN".
Set only the terminating resistor switch of
the remotest inverter to the "100Ω" position.
SG SDA1 SDB1 RDA1 RDB1
(GND) (TXD1+) (TXD1-) (RXD1+) (RXD1-)
+ TXD - + RXD -
+ TXD - + RXD -
SG SDA2 SDB2 RDA2 RDB2
(GND) (TXD2+) (TXD2-) (RXD2+) (RXD2-)
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)
5 V (permissible load current 100 mA)
Earthing (grounding) (connected to terminal SD)
Cut off with
a nipper, etc.
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5. PARAMETERS
5.12 (N) Communication operation parameters
1
2
3
4
5
6
7
8
9
10
for the wiring
497