Introduction - Hitachi WJ200-001S Instruction Manual

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Introduction

WJ200 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 are in the following table.
Item
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
Cable length
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.
Specifications
2400 / 4800 / 9600 / 19.2k / 38.4k /
57.6k / 76.8k / 115.2k 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
Terminal connector
Overrun, Framing block check code,
CRC-16, or horizontal parity
500m maximum
1
User-selectable
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