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如何判断任意节点的掉线?

我的终端挂在路由下面,路由挂在协调器下面,如果终端向协调器发送数据没有得到回应,请问我该如何判断是路由掉线了还是协调器掉线了?也就是说在一条数据链路上任意节点掉线我该怎么判断是哪个节点呢?