Glossary

Core
A single computation entity on the SOMANET SoC that operates like a thread.
Tile
A collection of 8 cores that shares some resources
Rotary Encoder
ABI / ABZ / QEI / Quadrature
BiSS
Common industrial open serial sensor protocol derived from SSI. It is mostly used in absolute rotary and linear encoders. As SSI it proscribes differential data transmission according to RS422 standard.
SSI
Common industrial open serial sensor protocol based on RS422 standard. Commonly used in absolute encoders.
A-Format
T-Format
RS-422
RS-485
Motor phase
Differential vs. single-ended

Differential and single-ended I/Os

Sensor connections can be used in single-ended or differential mode. Single-ended only needs one cable per connection but is susceptible to noise (1) as well as errors due to ground loops (2).

../../_images/single-ended.jpg

Differential connections use two wires where the signal is “mirrored”. The two signals are compared by an amplifier and only the signals that are opposite to each other count as valid.

This makes it insensitive to noise since the noise affects each signalling line in the same direction.