Hitachi SJ300-037HFE 사용자 설명서
Introduction
Append
ix
B
B–2
Introduction
SJ300 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.
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 SJ300 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 LSB 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
or horizontal parity
✘
SJ300
SJ300
SJ300
RS485 serial network
1
2
32