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Visually Enhanced Auto Checking

IP.com Disclosure Number: IPCOM000094831D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Haggard, TY: AUTHOR [+2]

Abstract

In long distance communication between typewriters, a known system causes the transmitting station to automatically interrogate a receiver for error upon the sending of a carriage return function code. The receiver generates a reply of error when a previous signal contained a parity error or when the just received signal, which is indication of the parity of all bits transmitted, differs from a stored indication of the parity of all bits received. By causing line space and a print out of a special symbol upon an error reply, the special symbol is displayed in a manner easily recognized.

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Visually Enhanced Auto Checking

In long distance communication between typewriters, a known system causes the transmitting station to automatically interrogate a receiver for error upon the sending of a carriage return function code. The receiver generates a reply of error when a previous signal contained a parity error or when the just received signal, which is indication of the parity of all bits transmitted, differs from a stored indication of the parity of all bits received. By causing line space and a print out of a special symbol upon an error reply, the special symbol is displayed in a manner easily recognized.

A carrier return input at the transmitter causes the following, all by logical structures permanently available in the terminals.

1. An actual carrier return is initiated at the transmitter.

2. A carrier return code is transmitted to the receiving terminal, where a physical carrier return is initiated.

3. An error interrogation code is automatically transmitted by the transmitter immediately following the carrier return code. The transmitting terminal becomes a receiver to look for an answer from the receiver.

4. Assuming that an error is observed, the answering terminal either prints an error symbol, one infrequently used in ordinary text, during return of its carrier or, if proper logic is present, prints an error symbol at the completion of the carrier return.

5. During printing of the error symbol, the answering terminal becomes a transmitter an...