Showing posts with label Baud Rate. Show all posts
Showing posts with label Baud Rate. Show all posts

Tuesday, May 8, 2012

What is the difference between Bit Rate and Baud Rate in Power Supply Remote Communications?

Many modern power supplies, such as TDK-Lambda's new Z+ programmable supplies and the HFE series of rack mount supplies, now feature serial data interfaces such as I2C, USB 2.0, and RS485, to name a few. The transmission rates of these serial data interfaces are specified as bits-per-second (bits/s) and/or baud rate. As a refresher, here is a brief review of the difference between Bit rates and Baud rates.

The Bit rate is the number of bits (binary zeros and ones) that are transmitted during one second (bits/s). The Baud rate refers to the number of signal units (symbols or characters) that are transmitted per second.

Equation for Baud Rate:
baud rate = bit rate (bits/s) ÷ N, where N is the number of bits represented by each signal shift (symbol or character).
For example, if the bit rate is 9,600 bits/s and the communications format require 8 bits per symbol, the baud rate would be 9,600 bits/s divided by 8 bits, which would equal 1200 baud.

Equation for Bit Rate:
Bits/s = baud per second x the number of bits per symbol
Therefore, from the above example:
Bits/s = 1200 baud x 8 bits = 9,600 bits/s

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