
The industrial AI edge gateway supports Modbus RTU/TCP protocol to acquire sensor data for AI analysis. To ensure stable communication of the RS485 interface under industrial common-mode voltage, it is recommended to use TVS ESDSM712, which is designed specifically for RS485 with 7V/12V dual shutdown voltage and a junction capacitance of 5pS. A series common-mode inductor CML3225A-510T is also used to suppress 1-30MHz common-mode current. A gas discharge tube 2R090L-5.5X6 is connected in parallel to ground on the A/B lines as primary coarse protection. The 2R tube has a 090V operating voltage and a 90V operating voltage. The L tube has a 5.5×6mm wire type and has passed IEC61000-4-6 10V conducted immunity testing, with a communication bit error rate of <10^-9.