Hitachi L300P - Manual (Page 228)

Introduction
Append
ix
B
B–2
Introduction
L300P inverters have a built-in RS485 serial communications interface. This serial communica-
tions function provides a way of controlling from 1 to 32 inverters on a common serial network.
In a typical application, a host computer or controller is the master and each of the inverter(s) is
a slave, as shown in the figure below.
The specifications for L300P Series RS485 serial communications are in the following table:
Item Specifications User-selectable
Transmission speed 2400 / 4800 / 9600 / 19200 bps
✔
Communication modes Half duplex (one device transmits at a time)
✘
Synchronization Direct current transmission ✘
Character code ASCII codes
✘
LSB placement Transmits LBB first
✘
Electrical interface RS485 differential transceiver ✘
Data bits 7 or 8 bits
✔
Parity None / even / odd ✔
Stop bits 1 or 2 bits
✔
Start convention One-way start from host device command
✘
Wait time for response 10 to 1000 ms ✔
Connections Station address numbers from 1 to 32
✔
Error check Overrun / Fleming block check code / vertical
or horizontal parity
✘
L300P L300P L300P
RS485 serial network
1 2 32