B–2

Introduction

Introduction

L2002 Series inverters have built-in RS-485 serial communications, featuring the ModBus RTU protocol. The inverters can connect directly to existing factory networks or work with new networked applications, without any extra interface equipment. The specifications for L2002 serial communications are in the following table.

 

 

Item

SpecificationsUser-selectable

 

 

 

 

 

 

 

 

 

 

 

 

Transmission speed

4800 / 9600 / 19200 bps

 

 

 

 

 

 

 

Communication mode

Asynchronous

 

 

 

 

 

 

 

 

 

Character code

Binary

B

 

 

 

 

 

LSB placement

Transmits LSB first

Appendix

 

 

 

 

 

 

Electrical interface

RS-485 differential transceiver

 

 

 

 

 

 

 

 

 

Data bits

8-bit (ModBus RTU mode)

(ASCII mode not

 

 

 

 

available)

 

 

 

 

 

 

 

Parity

None / even / odd

 

 

 

 

 

 

 

Stop bits

1 or 2 bits

 

 

 

 

 

 

 

Startup convention

One-way start from host device

 

 

 

 

 

 

 

Wait time for response

0 to 1000 msec.

 

 

 

 

 

 

 

Connections

Station address numbers from 1 to 32

 

 

 

 

 

 

 

Connector

RJ45 modular jack

 

 

 

 

 

 

 

Error check

Overrun, Fleming block check code,

 

 

 

CRC-16, or horizontal parity

 

 

 

 

 

 

The network diagram below shows a series of inverters communicating with a host computer. each inverter must have a unique address, from 1 to 32, on the network. In a typical application, a host computer or controller is the master and each of the inverter(s) or other devices is a slave.

Host computer

ModBus Network

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

32

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HITACHI

 

POWER

 

HITACHI

 

POWER

 

 

 

HITACHI

 

POWER

 

 

 

 

5 0.0

Hz

 

ALARM

 

 

50.0

Hz

 

ALARM

 

 

 

 

50.0

Hz

 

ALARM

 

 

 

 

A

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

RUN

 

 

 

 

 

 

 

 

RUN

 

 

 

 

 

 

 

 

 

 

RUN

 

 

 

 

 

 

 

 

RUN

STOP PRG

 

 

 

 

 

 

RUN

STOP PRG

 

 

 

 

 

 

 

 

RUN

STOP PRG

 

 

 

 

 

 

 

 

RESET

 

 

 

 

 

 

RESET

 

 

 

 

 

 

 

 

RESET

 

 

 

 

 

 

 

 

FUNC.

1 2

STR

 

 

 

FUNC.

1 2

STR

 

 

 

 

 

FUNC.

1 2

STR

 

 

 

 

 

L2002

 

 

 

L2002

 

 

 

 

 

L2002