Mitsubishi Electronics FR-S500 Wiring methods, Wiring of one RS-485 computer and one inverter

Handling of the RS-485 connector

<Wiring methods>

1) Wiring of one RS-485 computer and one inverter

Computer Side Terminals
		Cable connection and signal direction
Signal	Description
name
				10 BASE-T Cable
RDA	Receive data
RDB	Receive data
SDA	Send data
SDB	Send data
RSA	Request to send
RSB	Request to send		(*1)
CSA	Clear to send
CSB	Clear to send				0.2mm2 or more
SG	Signal ground
FG	Frame ground

Inverter

RS-485 connector

SDA

SDB

RDA

RDB

SG

2) Wiring of one RS-485 computer and "n" inverters (several inverters)

Cable connection and signal direction

Computer		10 BASE-T Cable
RDA
RDB
SDA
SDB
RSA
RSB	(*1)	RDB RDA SDB SDA	RDB RDA SDB SDA
CSA
CSB
		SG	SG
SG
FG		Station 1	Station 2
		Inverter	Inverter

RDB RDA SDB SDA SG

Station n

Inverter

Terminating resistor (*2)

REMARKS

*1. 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 change with the model.

*2. The inverters may be affected by reflection depending on the transmission speed or transmission distance. If this reflection hinders communication, provide a terminating resistor. When the RS-485 connector is used for connection, a terminating resistor cannot be fitted, so use a distributor. Connect the terminating resistor to only the inverter remotest from the computer. (Terminating resistor: 100Ω)

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