Subway Dedicated Signal Conversion and Transmission System

Project Pain Points

Subway transportation systems are characterized by long lines, harsh environments (such as strong electromagnetic interference and lightning strike risks), and dispersed equipment. Emergency telephones and power distribution cabinets in tunnels, as well as gate systems, access control systems, some older fire alarm panels, and environmental monitoring sensors (such as temperature, humidity, and water leakage sensors) in the depot, typically use traditional serial communication methods.

Solution 

To integrate these dispersed serial devices, Maxon serial fiber optic converters with the serial port server can be deployed inside the field equipment boxes. This device converts electrical signals transmitted via traditional serial ports (such as RS232, RS485, RS422, etc.) into optical signals that can be transmitted through optical fibers与TCP/IP.  These signals are then connected to the local area network via fiber optics and uploaded to the integrated monitoring system. At the receiving end, the optical signals are converted back into serial electrical signals, thus achieving long-distance, interference-resistant communication between two serial devices (or between a serial device and a control system).  

This solution effectively addresses the long-standing "information silo" problem of subway equipment data, avoiding the inefficient situation where maintenance personnel have to inspect and diagnose each device on-site. By unifying the data from multiple independent subsystems, it achieves centralized and intelligent operation and maintenance of the depot, significantly improving maintenance efficiency and system reliability.