3. Star
The connection of RS485 net is in Wye mode. Anti signal reflecting resistor
may be needed in each line.
The recommendations for the high quality communication,
Good quality shielded twisted pair of cable AWG22 (0.6mm2) or larger is very
important.
The shield of each segment of the RS485 cable must be connected to the
ground at one end only.
Keep cables away as much as possible from sources of electrical noise.
Use RS232/RS485 or USB/RS485 converter with optical isolated output and
surge protection.
28
Fig 2.34 Star mode
232/485
Converter
Master
PC
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