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RS-485 working model with termination resistor:
To maximum RS-485 driving ability, manufactory default setting is Disable.
(Disable 120 ohms termination resistors across the two wires).
(2) RS-485 Carrier Sense Technology (Default: Enable)
RS-485 Carrier Sense technology is the data flow control under RS-485 half
duplex (one-way traffic) communicating. It manages data flow between
computers or devices or between nodes in a RS-485 network, so that the data
can be handled at an efficient pace
RS-485 Carrier Sense technology will check the state of RS-485
communication bus. If the bus is idle, it starts transmission. If the bus is not idle
SUNIX PC Host Card
Device
D + (Tx+)
D – (TX-)
D +
SUNIX PC Host Card
Device
Tx +
Tx –
Rx +
Rx –
Rx +
Rx –
Tx +
Tx –
