Device for the serial exchange of data between two stations

Details Device for the serial exchange of data between two stations Device for the serial exchange of data between two stations

1995-11-21

1997-07-08

Olms, Douglas W.

Multiplex communications

Duplex

H04B 156

Patent

active

056469381

ABSTRACT:
In a device for the serial exchange of data between two stations, each station has a serial interface which is connected to a common data transmission line. A first specific station has means which, during the reception of data, identify the two possible bit states on the basis of different voltage levels on the data transmission line. In contrast, the second specific station has means which, during the reception of data, identify the two possible bit states on the basis of the presence or absence of a specific current flow via the data transmission line. Furthermore, in another device for the serial exchange of data between two stations, suitable selection of resistors ensures that four different voltage levels are produced on the data transmission line when each station transmits a "1" bit state or a "0" bit state. The voltage levels are evaluated differently by the stations, with the result that simultaneous data transmission in both directions is also possible.

REFERENCES:
patent: 3832489 (1974-08-01), Krishna
patent: 3835252 (1974-09-01), Ananiades et al.
patent: 3943284 (1976-03-01), Nelson
patent: 4477896 (1984-10-01), Aker

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