Specifications

Chapter 2 - System Configuration RS-422 And RS-485 Applications Ebook
Page 39 of 137 Manual Documentation Number: <DocNumber>
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Using Repeaters
In some cases a system requires longer communications lines or more
nodes than biasing requirements or the EIA/TIA-485 specifications can
accommodate. A common, and effective, solution is to use repeaters.
An RS-485 repeater can be placed in a system to divide the load into
multiple segments. Each "refreshed" signal is capable of driving
another 4000 feet of cable and an additional 31 RS-485 loads.
Figure 26: B&B 485OP Optically Isolated RS-485 Repeater
When using repeaters the Protective Ground connection should aways
be connected earth ground.
Figure 27: Using Isolated Repeaters