Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Redundant termination of a communication line for maintaining the line properly terminated when one of the terminations is unpowered










Image Number 2 for United States Patent #4890271.

An input and output system has a plurality of tape drives (1-3) connected by a daisy-chained bus (5) to a processor (4). Each of two tape drives (2, 3) at the end of the bus has a terminator (30, 31) for transmit lines (6) of the bus. Each terminator of each line comprises a pull-down resistor (40) connecting the line to ground, and a pull-up resistor (41) and a diode (42) in series connecting the line to a source of potential (43). When a source is powered up, potential is present and a diode connected thereto is forward biased and supplies potential to the line. When the source is powered down and potential is withdrawn, a diode connected thereto becomes reverse-biased and prevents the powered-down source from grounding the line. Redundant termination of each line therefore allows any one tape drive to be powered down without precluding communications over the bus from continuing while the other terminator continues to supply the line with potential.








 
 
  Recently Added Patents
Apparatus and method for image encoding/decoding using predictability of intra-prediction mode
Disk array apparatus and firmware update method therefor
Charging seat having cleaning member
Video-recording reservation management apparatus, method, program, and system
Imaging lens with three lens elements, and electronic apparatus having the same
System and method for calibrating display device using transfer functions
Apparatus and methods for color displays
  Randomly Featured Patents
Internal combustion engine
Device and method for simulation of WFS systems and compensation of sound-influencing properties
Device for clamping a toothed strap, particularly for a closure for sports footwear
Seek operation on different recording density regions based on the reflection of a boundary area
Wind turbine
Quick-response accelerometer with increased contact dwell time
Toys representing living beings, in particular dolls
Circularly polarized local antenna arrangement for a nuclear magnetic resonance tomography apparatus and method for operating same
Infant bounce and rocking chair
Method for spectroscopy of surface plasmons in surface plasmon resonance sensors and an element for the use of thereof