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You are here: Home / Encoders / POSITAL Motor Feedback Kit Encoders — now with open-source BiSS interface

POSITAL Motor Feedback Kit Encoders — now with open-source BiSS interface

January 25, 2018 By Lisa Eitel Leave a Comment

Rotary encoder specialist POSITAL has expanded its interface offerings for its magnetic Kit Encoders with support for the nonproprietary open-source BiSS Line communication protocol. This enables the practical implementation of single-cable technology, which is becoming increasingly popular with motor and robot manufacturers. POSITAL’s easy-to-install motor feedback kits, which feature 17-bit electronic resolution, bridge the gap between simple resolvers and more complex and expensive optical encoders for servomotors, robot joints and other applications where absolute rotary position feedback is required.

POSITAL’s magnetic Kit Encoders support open-source BiSS Line communication protocol, enabling Single-Cable technology.

Single-cable technology involves the transmission of power and encoder signal in a single cable. The one-cable approach offers significant benefits for smaller motors where the placement of two connectors has always been awkward because of the lack of space. What’s more, reduced cabling reduces costs, while reducing the number of connectors reduces susceptibility to connector failures. A special feature of the BiSS Line interface is the implementation of the Forward Error Correction function (FEC), which improves availability of data communications, even with faulty cables and plug connections.

“All in all, BiSS Line is a suitable interface for servomotors … and not just for cost reasons, but also for optimized performance,” says Christian Fell, POSITAL’s V.P. of Technology and General Manger for the Americas. A four-wire setup (with separate conductors for communication and power supply) or a two-wire variant (with combined communication and instrument power supply on a wire pair), are also available, based on the same communications protocols.

From their original introduction, the new motor feedback kits were available with vendor-neutral digital communication interfaces such as BiSS-C or SSI for absolute measurements. “A number of optical feedback systems on the market make use of proprietary interfaces such as Hiperface or Endat, which means an ongoing dependency on the encoder manufacturer. We deliberately took a different approach,” emphasizes Fell. “We are whole-hearted advocates of open-source interfaces – and stick to them consistently.” POSITAL’s commitment to the open-source strategy is affirmed by the fact that the encoder manufacturer is a founding member of the BiSS Association e.V. This new user organization (founded at the end of September) will promote the distribution of the free-of-charge BiSS family of open-source communication protocols worldwide.


POSITAL is a supplier of advanced industrial position sensors used in a wide variety of motion control and safety systems. The company is also an innovator in product design and manufacturing processes and a pioneer of Industry 4.0 (Industrial Internet of Things/IIoT), offering customers the benefits of built-to-order products combined with the price advantages of mass-production. POSITAL is a member of the Intl. FRABA group, whose history dates back to 1918, when its predecessor, Franz Baumgartner elektrische Apparate GmbH, was established in Cologne, Germany to manufacture relays. Since then, the company has played a trendsetting role in the development of rotary encoders, inclinometers and other sensor products. POSITAL has a global reach with subsidiaries in Europe, North America and Asia – and sales and distribution partners around the world.

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Filed Under: Absolute Encoders, Encoders, Featured, Fieldbuses, Networking + IoT Tagged With: fraba, positalfraba

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