The class of CMDBCOMMUNICATION is the class for controling the Bill Validator and Coin Charger based on the protocol of MDB(Multi-Drop Bus),The following words will show you the meanings of relative variable and function in details.

利用串口读写数据实现的识币器驱动程序，其中的串口通信实现方法可以 -Serial read and write data to achieve the coin Driver, one of the serial communication method can