Automatic baud rate detection

Automatic baud rate detection on UART (ABR, autobaud) refers to the process by which a receiving device (such as a modem) determines the speed, code level, and stop bits of incoming data by examining the first character, usually a preselected sign-on character (syncword). ABR allows the receiving device to accept data from a variety of transmitting devices operating at different speeds without needing to establish data rates in advance.

During the autobaud process, the baud rate of received character stream is determinted by examining the received pattern and its timing, and the length of a start bit. These type of baud rate detection mechanism are supported by many hardware chips including processors such as MPC8280, MPC8360, and so on.

See also

• Telecommunications

References

This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November 2008 and incorporated under the "relicensing" terms of the GFDL, version 1.3 or later.

• "17.2 Autobaud Operation on a UART in MPC8280 PowerQUICC™ II Family Reference Manual" http://www.nxp.com/files/netcomm/doc/ref_manual/MPC8280RM.pdf
• "Automatic Baud Rate Detection on the MSP430" http://www.ti.com/lit/an/slaa215/slaa215.pdf
• "How to implement “auto baud rate detection” feature on Cortex-M3" http://stackoverflow.com/questions/38979647/how-to-implement-auto-baud-rate-detection-feature-on-cortex-m3