29
AcuDC 200 Series
devices can be connected on a RS485 bus. Use good quality shielded twisted pair
cable, AWG22 (0.5mm
2
) or larger. The overall length of the RS485 cable connecting
all devices cannot exceed 1200m (4000ft). AcuDC 200 is used as a slave device of
master like PC, PLC, data collector or RTU. If the master does not have an RS485
communication port, a converter (such as a RS232/RS485 or a USB/RS485 converter)
will be required.
Typical RS485 network topologies include line, circle and star (wye).
1. Line
AcuDC 200 meters are connected one by one (daisy chain format) from the master
in the RS485 net as in fig 2.20.
Fig 2.21 Line mode
主机
232/485
转换器
Rt
单点接大地
屏蔽双绞线
防反射电阻
EV150
EV150
EV150
AcuDC 200
AcuDC 200
AcuDC 200
PC
232/485 Converter
Ground
Shielded Cable
Anti-reflecting Resistor
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.com
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