The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 1997
Filed:
Dec. 19, 1994
Seiji Kachi, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A method of carrying out start-stop synchronous communications is disclosed in which, when improper synchronization takes place owing to the transmission of a recovery frame for improper synchronization having information bits all indicating '0' subsequent to an information frame for transmission, a framing error is produced and the improper synchronization is detected on a receiving side and proper or normal synchronization is established upon receipt of the next frame. Here, a recovery frame for improper synchronization having information bits that all indicate '0' is transmitted immediately after an information frame. When any '0' in a data bit section of the information frame immediately before the frame of all 0 bits is misrecognized as a start bit upon receipt, '0' of the recovery frame is always placed in the position of the stop bit of the misrecognized frame so that a framing error is produced. Since an edge that falls from '1' to '0' does not exist in the recovery frame for improper synchronization, a start bit of the next frame can be accurately supplemented so that an improper synchronizing state is returned to a normal synchronizing state.