Communications: electrical – Digital comparator systems
Patent
1975-09-03
1977-05-17
Pitts, Harold I.
Communications: electrical
Digital comparator systems
178 58A, H04Q 100
Patent
active
040245012
ABSTRACT:
A line driver system for digital communication, using logic-level voltages, between an electronic transmitter-receiver device and an electronic receiver device, such as between a computer and a typewriter, a line printer or a cathode ray tube, has the transmitter-receiver device at a location remote from the receiver device. An output of the transmitter-receiver device is electronically coupled to an input of the receiver device using one line of a communications bus. This output of the transmitter-receiver device is coupled to that line of the bus through an optical isolator and then through a power booster. The receiver device has an output that provides a voltage signal when the receiver device is switched on-line. This voltage signal is provided at that output of the receiver device when the receiver device is capable of transforming digital information, that is provided at its input, to a readable form that is printed or displayed by the receiver device. This output of the receiver device is coupled through another optical isolator and through another power booster to a second line of the bus so that this second line of the bus receives a voltage signal when the receiver device is in the on-line condition. This second line of the bus is electronically coupled to an input of the transmitter-receiver device that senses the presence of this signal at that input prior to initiating a transmittal of digital information as logic-level voltages to the first line of the bus to provide logic-level voltages at the input of the receiver device. Each power booster has a high current gain amplifier with unity voltage gain. When the receiver device is also a transmitter device another output of the receiver device is electronically coupled through an optical isolator and a further power booster to a third line of the bus that is electronically coupled to another input of the transmitter-receiver device so that digital information as logic-level voltages are received from the receiver device by the transmitter-receiver device.
REFERENCES:
patent: 3843834 (1974-10-01), Burke
patent: 3872439 (1975-03-01), Salam
patent: 3875332 (1975-04-01), Fletcher
patent: 3943284 (1976-03-01), Nelson
Herring William M.
Johnson James P.
Walling Dennis B.
Gilkes Arthur G.
McClain William T.
Pitts Harold I.
Standard Oil Company
White Claron N.
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