The most common baud rate used is 9600 bps, but there are also many other standard values (2400, 4800, 19200, 57600, etc.). This rule allows you to avoid using the CLOCK as you know the length and speed of each individual data bit a priori. It is generally expressed in bps (bits per second) and its inverse value will indicate how much time a single bits occupy in data transmission. The baud rate is a rule (or configuration) that specifies how fast the data is sent on the serial line. So when two devices set up asynchronous serial communication, it is important that they are configured in the same way, following the same rules. These rules allow you to make data transfer more reliable: The asynchronous serial protocol is based on an intrinsic mechanism based on some rules. The rules of asynchronous serial communication The most common serial protocols are Bluetooth, Xbee, GPS module.

At the expense of this, a reliable system for transmitting and receiving data must be implemented. I2C and SPI are two synchronous serial communication protocols.Īn asynchronous serial communication, on the other hand, does not use an external CLOCK signal and therefore requires less I / O channels for communication. This particular configuration allows a simpler and often faster data transfer, but also requires an additional channel to communicate. Generally, all serial protocols can be divided into two groups: synchronous and asynchronous.Ī synchronous serial communication is always coupled with a CLOCK signal, so that all devices on the serial bus share a common clock. But there are many other protocols, each one specializing in a particular purpose. Other protocols such as SPI and I2C are known and used by the electronics industry.

Some of these, such as USB (Universal Serial Bus) and Ethernet, have been very successful and are known to the profane.

Over the years, many types of serial protocols have evolved over time to meet largely the needs of the moment. So often it is used for serial communication, though it is less fast, however, it can still use a few channels. This in some cases is really a problem since many microprocessors do not have many I / O ports available and a parallel communication would take many, too many. But there is one aspect that needs to be taken into account: it requires many I / O lines. Parallel communication is therefore more efficient: it is faster, simple, and relatively easy to implement.

Serial vs parallel communication