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SERCOS (SErial Real time COmmunication System) interface is a worldwide standardized digital interface  for the communication between controls and drives (IEC 61491 and EN 61491).

As a transmission medium for sercos® I and II a Fibre Optic ring is used. sercos® III communicates on the physical medium of Ethernet, but later a Fibre Optic variant will be developed.


  • collision free transmission with the help of a time slot procedure
  • very efficient communications protocol
  • regulation of for example 40 axes with a cycle time from 1 ms and a jitter smaller than 1 µs.

sercos® interface is supported by sercos® International e.V. (SI).