F R O N T P A N E L - Philips SPENDEX 40 Maintenance Manual

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4 . 2 F r o n t p a n e l
4 . 2 . 1 Z E R O I S E p u s h b u t t o n
As soon as the ZEROISE push button is pressed, the signals ZER01N and
ZER02N are activated. The signal ZER01N is passed on to the comsec
controller and the signal ZER02N to the zeroise circuit on the key
memory board.
4.2.2 SECURE push button
As soon as the SECURE push button is pressed, the signals CLRSC1 and
CLRSC2 are activated. The signal CLRSC1 is passed on to the comsec
controller and the signal CLRSC2 energises the clear/secure relay RE3
on the connecting board.
4 . 2 . 3 K e y b o a r d
The keyboard contains 16 keys.
4 . 2 . 4 K e y b o a r d i n t e r f a c e
The keyboard interface takes care of the coupling between the comsec
controller and the keyboard. Moreover the interface makes an
interrupt signal INTKEY every time a key is pressed.
4 . 2 . 5 D i s p l a y a n d L E D
The alphanumerical display with 8 characters, as well as the LED are
situated behind a window over the keyboard. The LED is to the right
of the display and is controlled by the comsec controller.
4 . 2 . 6 D i s p l a y i n t e r f a c e
The display interface takes care of the coupling between the comsec
controller and the display.
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