When The first time ATM to turn on the power, atm go on power up mode. In this mode atm will load all Operating system, Driver and ATM application. After power up mode finish and line communication with host established, ATM entering to Out Of service Mode. On this mode, the first time ATM sends Power fail Message to ATM-C for notification central the ATM ready for operate and need configuration data to download..
If central /ATM-C receives power fail Message from terminal, the central will be download configuration data to the terminal using a series write command message. Which the configuration data divided into 4 categories.
• States - state tables direct the terminal to the tasks to be performed during each part of a transaction
• Screens - screen data contains display, control, and delimiter characters for different screens which must be shown during different parts of a transaction.
• Miscellaneous data consists of terminal parameters (capabilities), LUNO (a unique number identifying each terminal), and terminal timer values.
• FIT entries - Financial Institution Tables entries provide information which is used for identifying which institution has issued a particular card, decoding or encoding of data and for electronic fund transfer.
This message exchange continues until all the configuration data has been sent to the ATM terminal. On completion, Central sends a Start-Up command message to the terminal, and the terminal goes into service

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