Will common-mode interference on the RS485 interface of an industrial AI edge gateway cause AI data packet loss?

Industrial AI edge gateway RS485 interfaces are prone to common-mode interference during long-distance transmission, leading to packet loss in AI data acquisition. Communication interruption occurs when the common-mode voltage exceeds the driver's common-mode range of -7V to +12V. Solutions include:

1) Connecting a TVS ESDSM712 in parallel with ground on lines A/B for precise clamping with dual shutdown voltages of 7V/12V;

2) Series common-mode inductor CML3225A-510T to suppress common-mode current;

3) Grounding the cable shield at one end and adding a 120Ω terminating resistor.

A test at a wastewater treatment plant showed that without protection, the common-mode interference amplitude was 20V and the packet loss rate was 15%. After protection, the common-mode interference was suppressed to 3V, the packet loss rate was 0.1%, and the AI data remained intact.