Universal interface for data communication systems

Pulse or digital communications – Repeaters – Testing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

307268, 178 63R, 328135, H03K 494

Patent

active

043853943

ABSTRACT:
A system for transmitting and receiving serial data over a pair of differential lines so that relatively large differences in ground potential will not affect the integrity of the transmitted data. Each differential line has a first switch for pulling the line high and a second switch for pulling the line low. Logical gates hold all switches off to allow the lines to float in response to a first control signal. A second control signal enables the logical gates to pull the first differential line up and the second differential line down whenever true data is to be sent and for pulling the second differential line up and the first differential line down whenever data is true. Associated with each switch is a protective diode and cold filament lamp for protecting the respective switch and insuring system operation even if large swings in ground potential occur. A differential amplifier has one input resistively coupled to the first differential line and a second input resistively coupled to the second differential line. A pair of matched resistors are coupled between the inputs of the differential amplifier and a reference point so that the values of the resistors establish the rail-to-rail operating range of the system. Various resistors at the input of the amplifier enable the data to be determined by differences in the currents in the first and second differential lines and not by the difference between a signal and local ground.

REFERENCES:
patent: 3671671 (1972-06-01), Watanabe
patent: 3868519 (1975-02-01), Green
patent: 4047122 (1977-09-01), Rao
patent: 4052611 (1977-10-01), Fish

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Universal interface for data communication systems does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Universal interface for data communication systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universal interface for data communication systems will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2148824

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.