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1. (WO2018040877) RECOVERY METHOD AND SYSTEM FOR PASSWORD KEYBOARD USB COMMUNICATION ABNORMALITY

Pub. No.:    WO/2018/040877    International Application No.:    PCT/CN2017/096821
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Fri Aug 11 01:59:59 CEST 2017
IPC: G06F 11/263
Applicants: FUJIAN LANDI COMMERCIAL EQUIPMENT CO., LTD
福建联迪商用设备有限公司
Inventors: LIN, Hui
林晖
WU, Minxing
吴闽星
Title: RECOVERY METHOD AND SYSTEM FOR PASSWORD KEYBOARD USB COMMUNICATION ABNORMALITY
Abstract:
A recovery method and system for password keyboard USB communication abnormality. The method comprises: insert frame numbers in data sent between a password keyboard and a connected device (S101); the password keyboard and the connected device return response information of each frame of data during data reception, the response information comprising data reception success, data reception failure, and data reception timeout (S102); detect whether USB communication between the password keyboard and the connected device is abnormal, and if yes, reestablish a communication connection by means of a communication reconnection mechanism (S103); and after the communication connection is reestablished, the password keyboard and the connected device determine, according to the received response information and the data frame numbers, whether data is repeatedly received, discard repeated data, and retransmit data (S104). By inserting frame numbers in sent data and establishing a data response mechanism and a communication reconnection mechanism, the technical solution can reestablish a communication service connection after communication is interrupted, and thus effectively resolves the problem of asynchronous communication parties or repeated operations caused by repeatedly receiving and sending the same data during communication abnormality.