Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1988-08-26
1990-04-03
Ng, Jin F.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379 97, 379 99, 375 8, 178 2R, H04M 1100
Patent
active
049146882
ABSTRACT:
A modem system includes an RS232C interface; a modulator/demodulator; an input-output device having a parallel interface connected with a data terminal unit having no communication function or having a parallel specification; a parallel-to-serial converter for performing the mutual conversion between parallel data and serial data; a memory for temporally storing the transmitted or recieved data; and a controller for controlling the transmission and reception of data. The modem system can perform the convertion between RS232C specification data and centronix specification data such that a parallel specification printer or plotter having no communication function can be used as an output device for data transmitted to the modem system through the telephone network.
REFERENCES:
patent: 4440987 (1984-04-01), Heep et al.
patent: 4637035 (1987-01-01), Betts
patent: 4641263 (1987-02-01), Perlman et al.
patent: 4682352 (1987-07-01), Durham
Kobayashi Tsunekazu
Sakuragi Satoshi
Chan Wing F.
Epstein Natan
Murata Mfg. Co. Ltd.
Ng Jin F.
Pavitt, Jr. William H.
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