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Chapter 8 Communication Functions
8 - 1
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
User-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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