Description: Asynchronous transfer in characters, irrespective of the length of the character code for the number of bits, in transmitting each asynchronous transmission character code, are coupled in front of a " from" signal, and its length is defined as one symbol, polar behind the character code is " 0" , i.e., empty No. polarity plus a " stop" signal, and its length is one or two symbols, the polarity are all " 1" , i.e. the same as the signal polarity, plus on from the stop signal is to be able to distinguish between serial transmission " character" , that is, to achieve a resumption of serial transmission, synchronization hair both code groups or characters.
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