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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.
HOST
COMPUTER
RS485
Option Unit
RS485
Option Unit
RS485
Option Unit
TXA
TXB
RXA
RXB
SG
FG
TXA
TXB
RXA
RXB
SG
SHIELD
TXA
TXB
RXA
RXB
SG
SHIELD
TXA
TXB
RXA
RXB
SG
SHIELD
SW3,SW4 = OFF SW3,SW4 = OFF
SW3,SW4 = ON
Set terminating resistor
Terminating
resistor
120Ω - 1/2W
Shielded twisted-pair cable
0.2~1.5mm
2
(AWG size: 24~16)
Ground
(
1
00
Ω
o
r l
ess)