Toshiba TOSVERT VF-AS3 Instruction Manual page 14

■ Wiring example for 2-wire
P5
Master
510
RXA+/TXA+
120
RXB-/TXB-
510
SG
Pull-up/pull-down resistor
120, 510 Ω - 1/2 W
3
Cautions for wiring
- To use RS485 in 2-wire, set [F829: RS485 (2) wiring type] to "0: 2-wire."
- Do not connect the 7 pin (power).
■ Wiring example for 4-wire
P5
510
120
510
510
120
510
9
Pull-up/pull-down resistor
120, 510 Ω - 1/2 W
Cautions for wiring
- To use RS485 in 4-wire, set [F829: RS485 (2) wiring type] to "1: 4-wire."
- Do not connect the 1 and 2 pins (open) and 7 pin (power).
- Do not bundle the communication cables and the main circuit wiring but keep a distance of 20 cm
or more.
- In the twisted pair cables, twist RXA and RXB, and TXA and TXB.
- Connect line terminations resistors at both terminals of whole serial bus.
- When using in inverter-to-inverter communication, the leader side receipt (4.5 pin)/follower side
(3.6 pin) line does not need to be connected.
A5
Important
3. RS485 communication wiring diagram
Straight
Slave
CN2
4 pin
RXA+/TXA+
5 pin
RXB-/TXB-
8 pin
SG
Cross
Master
CN2
4 pin
RXA
5 pin
RXB
3 pin
TXA
6 pin
TXB
8 pin
SG
• Be sure to use the pull-up/pull-down resistor and line terminations resistors.
Straight
Slave
RXA+/TXA+
RXB-/TXB-
SG
Straight
Slave Slave
RXA RXA
RXB RXB
TXA TXA
TXB TXB
SG SG
3-4
E6582143
Straight
Slave
RXA+/TXA+
120
RXB-/TXB-
SG
Line terminations resistor
120 Ω - 1/2 W
Straight
Slave
RXA
120
RXB
TXA
120
TXB
SG
Line terminations resistor
120 Ω - 1/2 W
VF-AS3