How to suppress interference from long cables in a concentrator?

Long cables connecting concentrators to remote devices are susceptible to electromagnetic interference (EMI). Suppression measures must be implemented at both the transmitting and receiving ends. Use well-shielded cables, such as double-shielded cables. Install effective filtering and protection circuits at the concentrator port, such as common-mode inductors CML3225A-510T and TVS diodes. For analog signals, use 4-20mA current loop transmission. For digital signals, use differential transmission (such as RS485) and ensure impedance matching. When laying cables, keep them away from high-voltage cables (parallel spacing >30cm) or run them through metal conduits. In particularly harsh environments, consider using signal isolators or fiber optic converters. Additionally, ferrite cores can be added at intervals (e.g., every 5 meters) along the cable to increase high-frequency loss. Through comprehensive suppression, long cable transmission systems can operate stably in industrial environments.