data communication network by means of a radio frequency transmitter this operation is known as the escape sequence if no account number is present between delimiters the system logic examines the telephone number transmitted by the pos device this telephone number would ordinarily be the number used to reach the authorization center in a modem transaction the logic checks a translation table created by the user to determine whether the telephone number corresponds to a known account for the radio frequency data communication network if so the information flow is again directed to the network should no account number be found in the translation table the system generates a 34 hang up signal 34 signifying a failed authorization inquiry the system logic assumes that a pos user will desire to use the radio frequency option for those credit cards that will allow it a user can however remove system power from the connection and translation device in that event a relay will direct the information flow to the telephone modem the hardware implementation of the translation and connection device consists of a single microprocessor and supporting peripheral devices specifically the invention employs an intel 80c188eb microprocessor an eeprom nat semiconductor part no 93c66 an intel flash rom a static ram various manufacturers a dtmf tone decoder.