Manual 26166V1 MicroNet Simplex & MicroNet Plus
Woodward 84
Figure 7-14. Termination and Cable Connection Examples
7.6.3-Grounding and Shielding
The RS-422 and RS-485 specifications state that a ground wire is needed if there is no other ground path
between units. The preferred method to do this is to include a separate wire in the cable that connects the
circuit grounds together. Connect the shield to earth ground at one point only. The alternate way is to
connect all circuit grounds to the shield, and then connect the shield to earth ground at one point only. If
the latter method is used, and there are non-isolated nodes on the party line, connect the shield to ground
at a non-isolated node, not an isolated node. Figures 7-24 and 7-25 illustrate these cabling approaches.
Non-isolated nodes may not have a signal ground available. If a signal
ground is not available, use the alternate wiring scheme in Figure 7-24
with the signal ground connection removed on those nodes only.
Figure 7-15. Preferred Multipoint Wiring Using Shielded Twisted-Pair Cable
with a Separate Signal Ground Wire
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