BITBUS
BITBUS is an international fieldbus which is, due to its synchronous transmission (SDLC) on RS485 and NRZI encoding, a lot more rugged then asynchronous or bit-arbitrating fieldbusses.
While BITBUS has lost the marketing momentum of Intel as a big player, many companies all over the world continue to use BITBUS due to its reliability and ease of wiring. ELZET80 has ported the BITBUS protocol to several modern processors (like ARM) for state-of-the-art client and server boards including PCIe and Ethernet.