Comparing SPI, RS-485, and SSI Protocols for Absolute Encoders

Comparing SPI RS-485 and SSI Protocols for Absolute Encoders

Encoders can play a large part in providing precisely tracked motor position and motion in a variety of applications. But, with a variety of encoder types and communication protocols to choose from, which combination of benefits and features make the most sense for your design?

Absolute encoders have become a popular motion control choice with their ability to determine rotor position immediately at power on, while further being able to keep track of position during a sudden loss of power. If going with an absolute encoder, the next choice comes down to the communication interface used to connect to the host system. RS-485 (aka TIA/EIA-485), SPI (Serial Peripheral Interface), and SSI (Synchronous Serial Interface) are several of the most common options available, each a viable choice depending on a variety of factors.

This CUI Insights blog post, “Integrating Absolute Encoders – An Overview of SPI, RS-485, and SSI Protocols” discusses the SPI, RS-485, and SSI communication protocols in greater detail, providing readers with a better understanding of their implementation and benefits.

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