E6581301

2.3.3 RS485 communication connector

The VF-AS1 is equipped with two connectors: a two-wire RS485 connector (on the operation panel) and a four-wire RS485 connector. The two wire RS485 connector is used to connect an external option (such as remote keypad or computer) to the inverter. To connect to a network, use the four-wire RS485 connector, following the instructions below.

Pin-1 Pin-8

2-wire RS485 communication

2

4-wire RS485 communication

 

2-wire RS485

Signal

Pin

Description

name

number

 

DA

4

Same phase data

DB

5

Anti-phase data

SG

8

Ground line of signal data

This table shows signal line of inverter side. * Never use pin-1, 2, 3, 6 and 7.

4-wire RS485

Signal

Pin

Description

name

number

 

RXA

4

Same phase reception data (positive line)

RXB

5

Anti-phase reception data (positive line)

TXA

3

Same phase transmitting data (positive line)

TXB

6

Anti-phase transmitting data (positive line)

SG

2, 8

Ground line of signal data

This table shows signal line of inverter side. (Example: RXA signal is received by inverter.) * Never use pin-1 (P24) and pin-7 (P11).

■ C￿￿￿￿￿￿￿￿￿ diagram for 4-wire RS485 communication

 

 

!

 

cross each other !

straight!

straight!

Upper

computer

 

 

 

or

VF-AS1

AS1 (slave)!

AS1 (slave)!

 

(master)!

 

 

 

 

 

RXA!

RXA!

RXA!

 

 

!

 

 

 

 

RXB!

RXB!

RXB!

 

 

TXA!

TXA!

TXA!

 

 

TXB!

TXB!

TXB!

 

 

SG!

SG!

SG!

 

AS1 (slave)!

RXA!

RXB!

TXA!

TXB!

SG!

Terminating resistance! 100Ω -1/4W!

Note

*Separate the communication line and the main circuit wiring by 20cm or more.

*Never use pin-1 (P24) and pin-7 (P11).

*Connect RXA and RXB, between TXA and TXB using twisted pair cable.

*Connect terminating resistances at both ends of a transmission line.

*When using 2-wire type, short RXB to TXB and RXA to TXA.

When connecting a communications device via the two-wire connector, carefully read the precautions for use in the operating manual for the communications device.

*When connecting the VF-AS1 to other inverters, you do not need to connect the master receive lines (pins 4 and 5) or the slave send lines (pins 3 and 6).

B-16

Page 58
Image 58
Toshiba VF-AS1 instruction manual 3 RS485 communication connector