In order to meet the demand of passenger traffic of the Shenyang Metro Line 1 and Line 2, the number of running trains was increased. But the connection between the train and the data communication system cannot be obtained in time, which makes the workload of the original maintenance staff increase substantially. In order to solve this problem, it needs to be discussed and studied in detail. This article discusses this problem with a research route to solve the real-time connection detection state of the d...