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Error Checking Procedure

IP.com Disclosure Number: IPCOM000090130D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Genko, A: AUTHOR

Abstract

In all communication systems involving a transmitter and receiver, there is a problem of correct transmission. Also a second problem arises as to determining whether the receiver is ready to accept the data or not. This method provides a solution to these problems. The principle of the method is to initiate the answer of the terminal as soon as it begins to receive a character. This is applicable to an asynchronous mode of transmission with a Start and Stop bit.

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Error Checking Procedure

In all communication systems involving a transmitter and receiver, there is a problem of correct transmission. Also a second problem arises as to determining whether the receiver is ready to accept the data or not. This method provides a solution to these problems. The principle of the method is to initiate the answer of the terminal as soon as it begins to receive a character. This is applicable to an asynchronous mode of transmission with a Start and Stop bit.

As soon as one bit is detected by the receiver, it is retransmitted to the transmitter which checks the identity as shown by drawing 1. If the transmission is correct, that is when the transmitter checks the identity of sent and received data. The transmission of data is uninterrupted and the beginning of the next character is an acknowledgement to the receiver that the previous one is correct as represented in drawing 2.

In order to determine whether the receiver is ready or not, it is possible instead of sending back the character transmitted, to send a special character to the transmitter. This character, 0 for occupied, is recognized, and sets the transmitter in an idle status. When the receiver is ready to accept the data, it sends it back as a reply, enabling the transmitter to continue. It is possible also to send back the received character except a Stop Bit. This indicates to the transmitter that the receiver is busy and initiates a repeal till the Stop Bit is received ba...