User's Manual

Octopus ATM Defense System
Installation and Operation Guide
Page 19 of 25
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17.1
17.2
17.3
ALERT mode operation:
ALERT mode is the only mode in which the CSUs can protect themselves. The CSUs are protected againt
thermal, light detection and tilt. This will prevent removal of the CSU from the ATM rack without activation.
Sending ALERT messages to CSU.
The first job of the MCU when going to alert is to notify the CSUs within the ATM system of the event. Including
the reason for the event.
Sleeping.
As with ARMED mode the majority of the ALERT time is spent in a sleep state (~ 98.72%). It will wake every
second to check for polled sensors (thermal and motion), upon any interrupt capable sensor, or when poll timeout
occurs.
Wakeup event or interrupt.
The system will wake every second to check for polled sensors (thermal and motion), upon any interrupt capable
sensor, or when poll timeout occurs. The CSU listens to determine if a polled communications is pending.
Wakeup Timeout /Check Alarms
=> Every 1 second, the MCU wakes up to check the alarms and sensors.
Regardless of whether the sensor are active all inputs are checked. Then after debounce processing
the alarms are registered as real events. The debounce registration process protects against short
duration glitches and EMI fields.
Wakeup Contact Change
Every time a interrupt occurs it is debounce processed and immediately compared for action
based on the software protocol.
Wakeup Polling Timeout
This is a periodic time which causes a interrogation of the CSU status and exchanges information of
state condition between the CSU and MCU.
Alarm verification:
When an alarm event occurs it is said to be “triggered”, this immediately causes the system to verify the validity of
the event by de-bouncing the input. After it is debounced, if the alarm still exists it is verified. Then it is
compared to the logic process to allow determination of action.
Disarming the armed system:
Level II operation requires a bolt indicator switch to check for authorized door opening. Both the Bolt and the
Door must open, in that order. This protects against ATM vandals who remove the ATM door without actuating
the bolt mechanism (unauthorized opening).
Processing ALERT events
The following events can cause an ALERT system to stay in ALERT mode, if the sensors are connected and
operational:
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