Hitachi WJ-0001S, User Manual

Page: 43 / 48

I i

Modbus Network Communication
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 Specifications User-selectable
Transmission speed 2400 / 4800 / 9600 / 19.2k / 38.4k /
57.6k / 76.8k / 115.2k bps
Communication mode Asynchronous
Character code Binary
LSB placement Transmits LSB first
Electrical interface RS-485 differential transceiver
Data bits 8-bit (Modbus RTU mode)
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 Terminal connector
Error check Overrun, Framing block check code,
CRC-16, or horizontal parity
Cable length 500m maximum
Connecting the Inverter to Modbus
Modbus connector is in control terminal block as below. Note that RJ45 connector (RS-422)
is used for external operator only.