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Device Identification by Test Signal Duration Disclosure Number: IPCOM000052403D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11

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Paska, TM [+details]


In the design of a universal attachment card to handle the interfacing of a variety of external devices to a data-processing unit, selection of the appropriate operating code requires an identification of the type of device that is actually attached. A classical approach to this problem is to define a unique cable connector pin (which is usually grounded) to represent each device type. If a large number of attaching devices are anticipated, then an equally large number of connector pins must be uniquely assigned and dedicated.