Communication control apparatus

Details Communication control apparatus Communication control apparatus

1993-03-22

1997-08-19

Nguyen, Koa T.

Excavating

371 201, 370249, 34082516, G01R 3128

Patent

active

056595484

ABSTRACT:
A communication control apparatus, provided with an echo back comparison detecting unit (30) detecting something abnormal of communication data from itself or an abnormal state generated at a data line (4), by starting transmission of communication data from itself following a detection of a line state detecting unit (29), when the line state detecting unit (29) detects that transmission of communication data from another communication apparatus to a data line (4) is started in a transmission permissible section, and by taking in communication data at the data line (4) and by comparing it with communication data having been transmitted from itself, and further provided with a transmission mark generating unit (23) shortening a bit width of data indicating a start of communication data transmitted from itself, prevents an abnormal waveform from being transmitted to the data line (4) because accuracy of echo back comparison is improved and delay tolerance of the data line (4) is eased.

REFERENCES:
patent: 4710918 (1987-12-01), Miyao
patent: 5012402 (1991-04-01), Pressprich
patent: 5142538 (1992-08-01), Fickes et al.
patent: 5272705 (1993-12-01), Okamoto

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