Specifications

Chapter 2 - System Configuration RS-422 And RS-485 Applications Ebook
Page 31 of 137 Manual Documentation Number: <DocNumber>
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No more than two terminations should be placed in any system that
does not use repeaters.
Figure 21: Two-Wire Multidrop Network
The risk of using bidirectional termination is that it adds heavy DC
loading to the system. Port powered RS-232 to RS-485 converters may
be overloaded by the use of bidirectional termination.
Daisy-chain topology has advantages for bidirectional termination: the
furthest ends of the network are relatively simple to determine.