• DO NOT insert or remove a communication cable during a communication device or the STP
pump's power is turned ON.
If the communication line is applied by surge voltage from a potential difference between
communication interfaces or static electricity, communication interface circuits may break down.
Communication failure frequently occurs if the communication interface circuit is broken.
If the communication interface circuits are broken, RS485 may still work according to the
environment. However, it is easy to get some communication errors. Therefore, check that the
differential signal waveform is normal with an oscilloscope if the circuits are suspected to be
broken.
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