专利名称：Synchronous/asynchronous modem 发明人：Jay P. Duncanson,Mark R. Murray
考研国家线2016申请号：US06/798822披荆斩棘
申请日：19851118
china government公开号：US04700358A
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摘要：An improved modem is described which can lectably operate in a synchronous communications mode, an asynchronous data mode, and an asynchronous command mode. A processor 47 controls the operation of the modem, adds starting and ending flags and frame check quences to transmitted data, arches for flags and sync characters in received data, adds and deletes start, stop and parity bits required for communications with the asynchronous communications element 18, and performs zero bit inrtion and deletion for HDLC/SDLC communications. Processor 47 also controls and monitors the operating parameters of the modem engine 60.
申请人：HAYES MICROCOMPUTER PRODUCTS, INC.
代理机构：Jones, Askew & Lunsford英文报纸
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