Data communication interface device

Details Data communication interface device Data communication interface device

1990-07-12

1991-09-24

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379401, 379406, 379344, 379347, 375 36, H04J 300

Patent

active

050519808

ABSTRACT:
A Data Communication Device permits extended range RS-232 communications between two devices by utilizing a current loop between the remote device and the Data Communication Device. The Data Communication Device may be used for any mix of signal or control lines specified for RS-232 and will support multiple remote devices in a broadcast mode or half duplex polled mode. Only a single Data Communication Device per remote communications circuit is required.

REFERENCES:
patent: 3646465 (1972-02-01), Hartlaub
patent: 3939435 (1976-02-01), Suzuki
patent: 4024501 (1977-05-01), Herring et al.
patent: 4443884 (1984-04-01), Swarz
patent: 4595803 (1986-06-01), Wright
patent: 4607170 (1986-08-01), Wickman
patent: 4621367 (1986-11-01), Horiguchi et al.
patent: 4683441 (1987-07-01), Naylor
Linear Applications, vol. 1, Radio Shack, National, May 1968, AN5-1-AN5-10.

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