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10
D+
D-
GND
1
2
3
485+
485-
RS485 device
RS485 interface
RS485 device
RS485 device
485+
485-
485+
485-
…
When RS485 is in point to multipoint communication, in order to prevent the reflection and interference of
the signal, each of a terminal resistance is required at the farthest ends of the line, with a parameter of 120Ω 1/2W.
IOT600-TWX-TS serial port side has no parallel terminal resistance.