The PCM will operate in two different modes: Open Loop and Closed Loop.
PCM将在两种不同的模式中工作：开路回路和闭路回路。
The scheme have two step: open loop test and closed loop test.
设计方案分为两步：开环测试和闭环测试。
Two way transmission between the train and ground facilitates closed-loop acknowledgement.
车-地之间双向传输，信息闭环确认；
Two way transmission between the train and ground facilitates closed-loop acknowledgement.
车-地之间双向传输，信息闭环确认；
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