Browse Prior Art Database

Transaction Data and Audit Function

IP.com Disclosure Number: IPCOM000084660D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Mizzi, JW: AUTHOR [+2]

Abstract

A point of sale system includes a processor, a number of terminals, and a communications loop interconnecting these components. A point of sale terminal transmits a sequence of messages to the host processor for each transaction. For some applications of a point of sale system, several transactions may be carried on simultaneously in an interleaved fashion. The processor makes a preliminary check to assure that the message was correctly received and does not have to be retransmitted and the processor acknowledges the message. The processor then operates on the message to modify the portion of its data base that pertains to the particular transaction.

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Transaction Data and Audit Function

A point of sale system includes a processor, a number of terminals, and a communications loop interconnecting these components. A point of sale terminal transmits a sequence of messages to the host processor for each transaction. For some applications of a point of sale system, several transactions may be carried on simultaneously in an interleaved fashion. The processor makes a preliminary check to assure that the message was correctly received and does not have to be retransmitted and the processor acknowledges the message. The processor then operates on the message to modify the portion of its data base that pertains to the particular transaction.

It is desirable to permit the terminal operator to enter a next message in a transaction as soon as an acknowledgement is received on the basis of the preliminary check, without waiting for the completion of the subsequent operations on the message. A new data transaction function provides a method and apparatus for assuring that the message is in fact operated on to completion by the processor, or that the terminal user is notified if a failure occurs.

There are many kinds of failures that will be recognized by the application programs of the host processor, and such a failure will lead to a routine to signal the operator to take some appropriate action such as the reentering of the message. On the other hand, it is possible that this mode of recovery will not be available.

The te...