| 摘要 |
A credit status verification system and method that affords high flexibility for use by merchants and bankers has a high speed, high capacity, on-line, real time computer which stores data concerning the credit status of the bearer of a particular decimal number, usually a customer bank account number. A plurality of terminal units in stores and/or banks generate input messages in a binary coded digital signal form to be received by the computer, and the computer produces output messages in a binary coded digital signal form to be sent to the terminal units preferably over telephone lines. A polling unit at the computer is used to continuously interrogate the terminal units to see if they are operational and if they have any input messages ready and also recognize poll-type input messages. Address characters with the messages locate the terminals and identify the incoming messages. A converter is used at the computer to step down the speed and change codes for output messages while changing them to asynchronous and to step up the speed and change codes for input messages while changing them back to synchronous. Interface controllers for the terminal units facilitate one controller remote from the computer for a plurality of terminal units, distinguishes between poll-type and response-type messages, and identifies the terminal unit for receipt of the input messages by the computer.
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