In many cases, serial is cheaper to implement than parallel. Therefore, it is possible to attain values from multiple sensors. The SSI allows to connect up to three slaves to a common clock.

Slaves use master’s clock and hence don’t need precision oscillators.

Not limited to a certain number of words and has an arbitrary choice of message size.

Complete protocol flexibility for the number of bits transferred.

High Electromagnetic interference immunity due to RS-422 standards and higher reliability of data transmission due to differential signalling.

This, in addition to the simplicity of SSI design due to use of minimal number of components, has considerably reduced the cost and created more transmission bandwidth for message bits.

Serial data transfer has reduced the wiring.

But this however reduces the protocol efficiency by 50% compared to parallel data transmission. In this case, two consecutive transmissions of the same data were initiated and compared for any error in transmission. In the original specification multiple transmissions were used to ensure data integrity. In simple words, they were used for identifying if the byte has been correctly interpreted and received. For secure transmission and to indicate the end of data transmission CRC bits or parity bits can be added.

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