LD TEDS: A Method for Long Distance Communication to Smart Transducers with TEDS
Mr. Douglas Firth, Precision Filters, Inc.
Mr. Stephen Finney, Precision Filters, Inc.

Abstract:
IEEE 1451.4 standard defines a Mixed-Mode Interface (MMI) that is alternately used for both Transducer Electronic Data Sheet (TEDS) data and analog signals.  The TEDS contains essential data pertaining to the transducer that the connected system may read via the same wires that the analog signal is delivered.  Presently, the distance between TEDS transducers and the interrogating instrument is limited to 400' due to communication protocol and design of the 1-wire memory devices.  In many shock and vibration test applications, safety, environment or other factors dictate that the cable runs to the transducers be in excess of 400'.  In this paper, we present a method that we call Long Distance TEDS (LD-TEDS) that allow instruments to communicate with TEDS equipped devices to 1500' and beyond.

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