Browse Prior Art Database

Dual Control Circuit

IP.com Disclosure Number: IPCOM000091127D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Dooley, TE: AUTHOR [+2]

Abstract

The circuit enables the control of two functions over a single wire, thus reducing the number of wires required in a remote system cable. The circuit includes transistors Q1 and Q2 connected to a source of potential at terminal 1 and ground at 2. The circuit includes control line 3 and connecting lines 4 and 5 for transmission of signals from remote station 6. The latter has switches 7 and 8 arranged for closure to connect either ground from terminal 2 to line 3 or plus potential from terminal 1 to such line. With switches 7 and 8 open, Q1 and Q2 are off. In operation, when switch 7 is closed, plus potential from terminal 1 activates Q2 which saturates, driving current through load RL2 to operate a first function A. When switch 8 is closed, ground from terminal 2 activates Q1, energizing load RL1 to operate function B.

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Dual Control Circuit

The circuit enables the control of two functions over a single wire, thus reducing the number of wires required in a remote system cable. The circuit includes transistors Q1 and Q2 connected to a source of potential at terminal 1 and ground at 2. The circuit includes control line 3 and connecting lines 4 and 5 for transmission of signals from remote station 6. The latter has switches 7 and 8 arranged for closure to connect either ground from terminal 2 to line 3 or plus potential from terminal 1 to such line. With switches 7 and 8 open, Q1 and Q2 are off. In operation, when switch 7 is closed, plus potential from terminal 1 activates Q2 which saturates, driving current through load RL2 to operate a first function A. When switch 8 is closed, ground from terminal 2 activates Q1, energizing load RL1 to operate function B. A saving in wires is realized, if, as an example, it is assumed the system has ten functions that ordinarily require eleven wires, that is, ten wires plus one for a ground wire. If the system incorporates five of the circuits shown, the number of wires can be reduced to a total of seven, that is, five control wires plus one for ground and one for plus potential.

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