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What type of tap or termination can be added to a Modbus RTU RS485 Network to prevent network communication fault?

You should start using the 120 ohms resistor in series with 1nF capacitor as end of line termination at both end of the network. If you still have the nuisance in the Modbus network, it is recommended to install the TWDXCAISO isolated tap according to the attached drawing.

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