Toshiba RS-485 operation manual Connection and start-up

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4. Connection and start-up

Connect the ASD with a host computer according to the procedure mentioned below.

Procedure

(1)Set the communication speed to SW on the RS-485 Option Unit.

(2)Connect terminating resistor in both ends of units. The RS-485 Option Unit has internal terminating resistor. Set SW3 and SW4 to ON to connect these terminating resistors.

(3)Install the RS-485 Option Unit on a metal panel.

(4)Connect the cable to the removable terminal block. If the stick-lugs are not used, strip the insulation from the wire and insert the wire directly into the terminal. Be sure not to short any wires. Run the cable as shown in the figure. Use a common cable in the system.

(5)Connect the shield of the twisted pair cable to the SHIELD terminal on each RS-485 Option Unit, and make the ground connection. Do not connect Host computer ground to a power ground or any other noise-producing ground connection.

(6)Insert the removable terminal block back into the RS-485 Option Unit.

(7)Connect the communication connectors (INVERTER1 and INVERTER2) of the RS-485 Option Unit to the communication connector (CN1) of the ASD with the optional cable.

(8)Turn on the power of ASD.

(9)Set the communication parameter of the ASD.

Shielded twisted-pair cable

0.2~1.5mm2

(AWG size: 24~16)

HOST

COMPUTER

Terminating TXA resistor

120Ω - 1/2W TXB

RXA

RXB

SG

FG

Ground

(100Ω or less)

RS485

Option Unit

TXA

TXB

RXA

RXB

SG

SHIELD

SW3,SW4 = OFF

RS485	RS485
Option Unit	Option Unit
TXA	TXA
TXB	TXB
RXA	RXA
RXB	RXB
SG	SG
SHIELD	SHIELD
SW3,SW4 = OFF	SW3,SW4 = ON
	Set terminating resistor

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