门关闭时,它提供输入X001。如果门打开,则输入消失,警报器开始工作。
使用PLSY指令控制对警报器的输出,警报器的音高或“音量”能被控制。一系列高频脉
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冲会发出高而连续的声音。如果使用一个低频输出,则会听到一个较低的、更“分散”的声音。
这是有可能的:一旦确定相应频率,就能得到警报器声音输出,随着时间声音升高降落。收到来自Y000的输出时,警报器声音的音量和音高都将增大。当来自Y000的信号不再出现时,警报器的音量和音高会下降,随之声音自然减弱并且/或者被中断。
警报器活动过程可以通过限定PLSY指令发出的脉冲数来控制。本例中,通过设置K0可得到连续脉冲输出。
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