6ES7902-2AC00-0AA0 20mA/TTY电缆

6ES7902-2AC00-0AA0 20mA/TTY电缆 10m遥控器有两种状态：学习状态和控制状态。当遥控器处于学习状态时，使用者每按一个控制键，红外线接收电路就开始接收外来红外信号，同时将其转换成电信号，然后经过检波、整形、放大，再由CPU定时对其采样，将每个采样点的二进制数据以8位为一个单位，分别存放到指定的存储单元中去，供以后对该设备控制使用。当遥控器处于控制状态时，使用者每按下一个控制键，CPU从指定的存储单元中读取一系列的二进制数据，串行输出（位和位之间的时间间隔等于采样时的时间间隔）给信号保持电路，同时由调制电路进行信号调制，将调制信号经放大后，由红外线发射二极管进行发射，从而实现对该键对应设备功能的控制。

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