16BB-HCM580A4.7. Others[I/O Terminal]• The Input terminal has two systems; both of them are connected to the Input Port of the IC102 GPIO.• Due to Internal Pull-up Resistance, the PNP Transistor (Q600, Q605) on the following level is usually in the OFF state and theInput Port connected to the collector is at L level.• If the terminal is short-circuited with the GND or the signal of L level is input, the PNP Transistor goes ON and the Input Portgoes to H level.• The CPU checks the state of this port regularly to detect a change in this signal.• The Output terminal is controlled by the Output Port of the IC102. When the Port output is L, the transistor (Q606) on the follow-ing level is OFF and, when the output is H, the transistor is ON. This transistor has open collector output and it controls externalequipment via external pull-up.[CLEAR SETTING SW(SW102)]• The Clear Setting SW (SW102) mounted on the CPU board is connected to the Input Port of the GPIO. It is usually at H level andgoes to L level, when the SW is pressed.• The CPU(IC102) monitors this Input Port periodically and, if it detects that this SW is pressed longer than a specified period, thesetting values other than the RTC are returned to factory settings.
