Browse Prior Art Database

Equipment Status Monitoring

IP.com Disclosure Number: IPCOM000090094D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Keller, WL: AUTHOR [+2]

Abstract

The arrangement is for monitoring the respective positions of control knobs or switches in computer controlled or augmented laboratory equipment. For example, in the system shown in drawing A, the time-shared computer can determine the positions of the knobs or switches on sampling oscilloscope 12. Terminal 14 includes a digital-to-analog converter and a multiplexer.

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Equipment Status Monitoring

The arrangement is for monitoring the respective positions of control knobs or switches in computer controlled or augmented laboratory equipment. For example, in the system shown in drawing A, the time-shared computer can determine the positions of the knobs or switches on sampling oscilloscope 12. Terminal 14 includes a digital-to-analog converter and a multiplexer.

The arrangement comprises monitoring resistive networks in oscilloscope 12 which are electrically isolated and independent of all other oscilloscope circuits, energized by constant current sources in terminal 14, and mechanically coupled to and altered by the switches and knobs in oscilloscope 12. In drawing B, each monitor circuit is energized by a constant current source which is contained in terminal 14 and all share a common return to terminal 14. Thus, through the multiplexer and analog-to-digital converter in terminal 14 and programs in computer 10, the positions of switches or controls associated with each monitor in oscilloscope 12 can be determined.

The monitor circuit switches are break-before-make. Transformer 18, placed in the common monitor return line, permits the detection of a change in the position of a detented knob, i.e., a change in the position of a detented knob or switch produces a transient change in current in the return line. Such current changes produce pulses in the secondary winding of transformer 18. The latter pulses, through pulse shaper 20...