User Manual

Chapter 8 Communication Functions
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8.1 Communication Specification
NE-S1 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 Use
r
-selectable
Transmission speed 4800 / 9600 / 19.2k / 38.4k 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 247

Connector Terminal connector

Error check
Overrun, Framing block check code,
CRC-16, or horizontal parity

Cable length 500m maximum
The network diagram below shows a series of inverters communicating with a host computer. Each
inverter must have a unique address, from 1 to 247, 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.
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