Toshiba RS4002Z-0, Instruction Manual

E6580938

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1. Overview

By using RS485 Converter Unit, a network can be constructed that allows communication between a
host computer or PLC etc. and multiple inverter units.

A maximum of 32 Option Units can be connected on the same network. And 8 inverters can be
connected to one RS485 Converter Unit. A maximum of 256 inverters

＊

  can be connected on the same

network.

＊

Only when communicating between inverters, and the number is limited when communicating with
individual inverters depending on the function of each inverter.)

Host computer

RS4002Z

INV

Connection with up to
8 inverters

(*) A maximum number of inverters connectable is 32 

×

 8 = 256. This number applies only to

communications between inverters. Up to 248 units can be connected in broadcast
communication. In the case of individual communications, the number is limited by the
function of each inverter.
Check the transmission format specification of the inverter to be used.

„

  Example of VF-A7 series inverter

・

Communication between inverters:

32 

×

 8 = 256 units max

・

Broadcast communication:

31 

×

 8 = 248 units max

(31 units because of 1 unit needed for PC.)

・

Individual communication (ASCII mode):

100 units max

・

Individual communication (binary mode):

64 units max

RS485

<System configuration>

INV

INV

INV

INV

INV

INV

INV

RS4002Z

INV

INV

INV

INV

INV

INV

INV

INV

2. 

Communication specifications

Item

Specifications

Interface

Conforming to EIA RS485 standard

Configuration

4-wire/2-wire, bus type (A terminating resistor is

required at both ends of the system)

Transmission method

Semi-duplex

Communication Distance

1,000m maximum

Number of option units connectable

32 units maximum (31 units when PC is connected)

Number of inverters connectable per option unit 8 units maximum
Number of inverters on the Same Network

256 units maximum 

（※）

Communication Line Isolation

Not isolated

Communication Speed

1200/2400/4800/9600/19200 baud selectable

(parameter and switch selection)

Bit length

11 or12 bits (switch selectable)