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RS485 signal ground pin

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Please read the section named as "connectors".

IMHO: network without SG (signal ground) worked very bad.




Typically yes, if you use 0v as your reference.  RS-485 two wire uses the voltage differential between A+ and B- as it's reference on a twisted pair wire.  The biggest advantage is both wires would be prone to the noise.  So if A+ is offset, B- is also offset by an identical amount and the differential is maintained.


There are also a 3 wire spec, and a 4 wire spec (4 wire is used for full duplex communication).  As always, you should still use grounded cable with the ground connection on one end to improve performance and minimize noise.


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