Rs-485 Full-Duplex, Multi-Drop Example - Campbell SDM-SIO1A Instruction Manual

Serial input/output module
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SDM-SIO1A Serial Input/Output Module

6.2.1.2 RS-485 Full-Duplex, Multi-drop Example

As with all RS-485 configurations, the use of termination resistors
NOTE
is optional. They tend not to be required with shorter cable runs
and with modern slew-rate-limited driver technology (as used in
the SDM-SIO1A).
11

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