Each RS485 interface has specific connection and
termination biasing requirements which will be detailed in
their installation instructions. The general principles are as
follows.
Terminations Because each wire is a transmission line, it
must be properly terminated to prevent reflections. Where
multiple instruments are daisy-chained together, a 120 ohm
terminating resistor should be fitted at the connection to
the PC and to the last instrument in the chain.
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