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How to improve the anti-interference of serial communication in intelligent low-voltage monitoring units?

Time：2026-01-01 Views：520次

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The serial communication interference immunity is improved using hardware filtering and software fault tolerance.

Hardware: A 22Ω resistor is connected in series on the TX/RX lines, with ESD5V0D8B protection in parallel. A CMZ2012A-900T common-mode inductor (90μH) is added. An ADM2483 isolation serial port chip (2.5kVrms isolation) is used.

Software: Timeout retransmission is added; checksums are added to data packets.

PCB: Serial port traces are kept away from interference sources and grounded.

Through these improvements, the bit error rate of serial communication is less than 10^-6 under a radiated field strength of 10V/m.

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