Abstract：For the effective protection of the subway signal maintenance support system of information security, the operational efficiency of subway to prevent the subway traffic accidents was improved, and the problem of the information security of a collecting system reaching design requirements was solved by using a serial port communication and communication interface to complete information acquisition data isolation technique and electrical isolation technique, and by the analysis of the intelligent device signal and real-time monitoring of timely found running fault and warning. The subway signal collecting design for a maintenance support system of information security has certain reference value and guiding significance.

Keyword：subway signal maintenance;information security collection;serial communication;communication interface;