Ward Caller Two

Published:2011/5/14 6:41:00 Author:Felicity | Keyword: Ward Caller , | From:SeekIC

When one button of S1-S81 is pressed, the inside program control circuit of the IC detects the bed number represented by the button number. And the pin 16 is at low level to make V10 close, and HA sends out a call. Pin 15 and pin 14 are at low level to make V11 or V12 close. Pin 21-28 output signals to drive the digital code scope to display the calling bed number while the LED corresponding to the pressed button is on. Once the reset button S0 is pressed, the lighted LED will be off, and the number displayed on the digital code scope will disappear, and HA will stop.



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