Browse Prior Art Database

Display Terminal Cable Isolation Using Optocouplers

IP.com Disclosure Number: IPCOM000047562D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Gorga, KJ: AUTHOR [+2]

Abstract

The shield on a display terminal coax cable must be isolated from ground in order to prevent grounded loops. The conventional way to do this is to float all of the electronics associated with the cable above ground. When terminal cable attachment for emulation purposes is to be made to a piece of existing equipment that is already grounded, such as the IBM Displaywriter or IBM Personal Computer, the conventional method of isolation cannot be used. One solution in such a contemplated connection is to isolate the receiver and driver electronics directly associated with the cable via opto-isolators and use a floating power supply for only those few components.

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Display Terminal Cable Isolation Using Optocouplers

The shield on a display terminal coax cable must be isolated from ground in order to prevent grounded loops. The conventional way to do this is to float all of the electronics associated with the cable above ground. When terminal cable attachment for emulation purposes is to be made to a piece of existing equipment that is already grounded, such as the IBM Displaywriter or IBM Personal Computer, the conventional method of isolation cannot be used. One solution in such a contemplated connection is to isolate the receiver and driver electronics directly associated with the cable via opto-isolators and use a floating power supply for only those few components.

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