Introduction - If you have any usage issues, please Google them yourself
control with 8,051 police have used examples of P1.0 1KHz and 500Hz output audio signal Flooding dynamic loudspeakers for alarm signal, a request KHz signal ring for 100 ms, 500Hz signal ring for 200 ms. alternating, then a switch P1.7 control, a switch off the alarm signal, when the switch disconnected warning signal to stop, write procedures.