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© Copyright Brainboxes Limited 2010 Page 39 of 47
RS485 Full Duplex
Note: The receiver end of MAIN line terminated in characteristic impedance, stubs off the main not
terminated.
7.1.15. Optional Grounding Arrangements
Proper operation of the cable circuit, according to TIA EIA: 485 A (1995) requires that the cable ground
shield is not connected directly to the equipment ground shield. A current limiting resistor should be used in
series with the shield to avoid possible large current flow due to differences in ground potential. Any one of
the methods shown below can do this.
Configuration A)