Introduction - Hitachi SJ2002 Series Instruction Manual

B–2

Introduction

Introduction

SJ200 Series inverters have built-in RS-485 serial communications, featuring the
2
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 SJ200
Transmission speed
Communication mode
Character code
LSB placement
Electrical interface
Data bits
Parity
Stop bits
Startup convention
Wait time for response
Connections
Connector
Error check
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
serial communications are in the following table.
2
Item
4800 / 9600 / 19200 bps
Asynchronous
Binary
Transmits LSB first
RS-485 differential transceiver
8-bit (ModBus RTU mode)
None / even / odd
1 or 2 bits
One-way start from host device
0 to 1000 msec.
Station address numbers from 1 to 32
RJ45 modular jack
Overrun, Fleming block check code,
CRC-16, or horizontal parity
ModBus Network
Specifications
1 2
SJ200
SJ200
2
User-selectable
✔
✘
✘
✘
✘
(ASCII mode not
available)
✔
✔
✘
✔
✔
—
—
32
SJ200
2
2