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在MasterSlaveSwitch工程中，当该模块作为从机被主机连上时，主机可以收到从机发来的数据，但是从机收不到主机发送的数据；当该模块作为主机去连接从机时，它能够接收到从机发来的数据，但是从机收不到主机发送的数据，请问是什么情况？
