Hitachi SJ200 Series manual 216

B–2

Introduction

Introduction

SJ200 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 SJ200 serial communications are in the following table.

	Item	Specifications	User-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

SJ200 SJ200 SJ200