Interconnection system for an electronic cash register

Details Interconnection system for an electronic cash register Interconnection system for an electronic cash register

1990-08-07

1993-01-12

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

364405, H04B 100

Patent

active

051793750

ABSTRACT:
A system for inputting signals to a terminal includes a first interface having an input port, the first interface including a decoder for decoding the signals received at said port for application to the terminal. Two external sources of signals are OR'ed to the same port. One or both the sources may include an external input device and an interface for translating signals from a first code output from the input device to a second code which the first interface is adapted to accept. In order to OR the outputs of the sources, the sources may have open collector output transistors connected to a common collector resistor in the first interface.

REFERENCES:
patent: 4249648 (1981-02-01), Meyer
patent: 4771382 (1988-09-01), Shiono et al.
patent: 4887209 (1989-12-01), Sugishima
patent: 4887210 (1989-12-01), Nakamura et al.

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