Data transmission apparatus having two unidirectional transmissi

Details Data transmission apparatus having two unidirectional transmissi Data transmission apparatus having two unidirectional transmissi

1984-12-31

1988-05-03

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 300

Patent

active

047424842

ABSTRACT:
A master station and a plurality of slave stations are connected in multi-drop connection. A carrier wave on an upstream transmission line between the master station and the slave stations is demodulated and re-modulated in each slave station and always maintained to be on-state. Both the modulating and demodulating devices are performed by a MODEM following the protocol CCITT V.28, respectively. Each MODEM used is connected to the respective slave station by a signal line following the protocol EIAR3 232C.

REFERENCES:
patent: 4365294 (1982-12-01), Stokken
patent: 4370744 (1983-01-01), Hirano et al.
patent: 4387458 (1983-06-01), Carbrey
patent: 4408300 (1983-10-01), Shima
patent: 4446551 (1984-05-01), Seo
patent: 4460994 (1984-07-01), Scanlon et al.
patent: 4501021 (1985-02-01), Weiss
patent: 4528675 (1985-07-01), Esterling et al.
patent: 4542496 (1985-09-01), Takeyama et al.
patent: 4542502 (1985-09-01), Levinson et al.
patent: 4587651 (1986-05-01), Nelson et al.

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