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The Shield Wire
2.0 The Shield Wire
This shield can be used as normal in both the NetAXS-4 and NetAXS-123. If the
environment is not electrically noisy, the shield can be left off. But in electrically
noisy environments, the shield can be used grounding only one (1) end of the cable
shield to prevent ground loops.
3.0 RS-485 Wiring for NetAXS-4 Loop
• The 485+ (A) of one controller is connected to 485+ (A) of the next controller
using one wire of the first twisted pair.
• The 485– (B) of one controller is connected to 485– (B) of the next controller
using the other wire of the first twisted pair.
• On a loop that contains all NetAXS-4 controllers, the 485 COM is connected. The
second pair of the wires are twisted together and connected to 485 COM on the
controller.
• The shield is only connected on one end of the cable, not both.
See Figure B-2 on page 81.
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