ATM. How it works.

RECEIPT PRINTER provides the cardholder with a paper receipt of the transaction. OUTPUT DEVICE CARD READER captures the INPUT DEVICE account information stored on the magnetic stripe on the back of an ATM/debit or credit card. The host processor uses this information to route the trans- action to the cardholder's bank. PARTS .... ... DISPLAY SCREEN OUTPUT DEVICE prompts the cardholder through each step of the transaction process. Leased-line machines com- OF THE monly use a monochrome or color CRT (cathode ray tube) display. Dial-up machines commonly use a ATM monochrome or color LCD. CASH DISPENSER The heart of an ATM is the safe and cash-dispensing mechanism. The entire OUTPUT DEVICE bottom portion of most small ATMS is a safe that KEYPAD lets the cardholder INPUT DEVICE OUTPUT DEVICE DEPOSIT SLOT is for depositing cash. tell the bank what kind of contains the cash. transaction is required (cash withdrawal, balance inquiry, etc.) and for what amount. Also, the bank requires the cardholder's personal identi- fication number (PIN) for ver- ification. Federal law requires that the PIN block be sent to the host processor in encrypted form. BANK TRANSACTION IS DISAPPROVED TRANSACTION IS APPROVED PIN IS OK CHЕCK PIN HSM* PIN IS ENCRYPTED .. COMMAND TO GIVE CASH ATM switch HOW PIN COMMAND TO INFORM WHAT'S WRONG TRANSACTION DETAILS ATM WORKS References: http://money.howstuffworks.com/personal-finance/banking/atm3.htm http://shayandes.blogspot.ru/2011/04/how-atms-work.html www.exness.com exness *HSM - Hardware Security System