Data transfer unit and method of power supply to the data transf

Details Data transfer unit and method of power supply to the data transf Data transfer unit and method of power supply to the data transf

1994-06-10

1996-05-21

Cosimano, Edward R.

Boots, shoes, and leggings

323371, H02J 400

Patent

active

055196349

ABSTRACT:
The present invention provides a data transfer unit interposed between a computer and a peripheral device for executing data exchange by a handshaking process based on a signal level. The invention also provides a method of supplying power to the data transfer unit. The data transfer unit includes a first power circuit and a second power circuit. The first power circuit receives an electric current via a diode D6 connected in a forward direction to a signal line RTS used for handshaking and generates a predetermined positive voltage of +12 volts. The second power circuit receives an electric current via a diode D1 connected in a reverse direction to the signal line RTS used for handshaking and generates the predetermined positive voltage of +12 volts. An auxiliary power of -12 volts is supplied from a data output signal line TXD in a printer. A voltage regulator (23) receives the output of the predetermined positive voltage and generates a steady voltage of +5 volts, which is supplied as power of a logic circuit.

REFERENCES:
patent: 4607170 (1986-08-01), Wickman
patent: 4630198 (1986-12-01), I-Yuan
patent: 4884287 (1989-11-01), Jones et al.
patent: 4901217 (1990-02-01), Wilson
patent: 5032742 (1991-07-01), Zanders
patent: 5313642 (1994-05-01), Seigel
patent: 5402015 (1995-03-01), Hammermann
patent: 5438678 (1995-08-01), Smith

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