How to ensure EMC for long-distance data transmission from power DTUs?

Ensuring EMC for long-distance DTU data transmission requires signal enhancement and interference suppression. Differential transmission methods (such as RS485) should be used with 120Ω impedance matching. Shielded twisted-pair cable should be used, with the shield grounded at one end (low frequency) or both ends (high frequency). Common-mode inductors (CML3225A-510T) should be deployed at both ends of the transmission line. Repeaters or signal amplifiers should be used to address signal attenuation. Signal integrity should be verified through eye diagram testing to ensure the eye diagram remains open over the longest distance. In actual testing, the bit error rate should be below 10^-6 over a distance of 1.2km. Ensuring EMC over long distances makes the system suitable for remote monitoring scenarios.