6) Communication Cable Details:
Figure 13 Communication Cable Connection
RS485 Cabling Methodology should be Shielded single twisted pair cable. RS485 is designed to be
used with a single twisted pair cable. It would reduce noise induced through ground potential
differences. This is the preferred option in areas where there is a potential for high electrical noise or if
cabling lacks the cleanliness of conduit or wire trays.
Good installation practice for RS485 systems:
Use RS485 shielded twisted cable to prevent electrical noise pickup.
Use a screened cable to prevent electrical noise pickup. This screen must be earthed at one
end only, UNIT-1.
Do not carry RS485 and power supply in same cables.
Do proper termination and/or shielding to provide isolation from high frequency interference,
RFI, and transients.
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