What are the different types of serial protocols?
Serial communication interface may vary in a number of different ways depending on the purpose. As a result, general methods or types of serial protocols are able to be narrowed to some general categorization. There are therefore five general types of serial protocol, each of which is somewhat dependent on the number of hosts and receivers. From there, each serial bus will have other features to offer different functions depending on the communication protocol used.
The most common is the recommended standard protocol 232 (RS-232). This falls into the Peer or Point-to-Point Serial Protocol and its concepts has been developed by a number of serial interfaces. Here, two devices or peers communicate directly among themselves in what is called full-double, which means that communication can go through at the same time. They can optionally synchronize their communication through hours, although colleagues most often communicate asynchronously. Limited speed and distance are commonly used to connect serialPeripheral devices to computer systems.
Another recommended standards, number 422, which came a little later describing another type of protocol that can support other systems. In serial protocols based on RS-422, other receivers can be supported by a single transmitter. This is referred to as a protocol with multiple drops. The speed increases dramatically compared to what is available with RS-232, including the wire length. However, the costs are that it only works in half the duplex, and therefore allows communication via wires at the same time at the same time, unless other wires are set between the receivers and the transmitter.
Like the RS-422, another recommended standard describing the multi-point option for serial protocols. Multibod technology, known as the RS-485, allows multiple peers to send each other and receive through the bus. Like RS-422, they are serialRS-485 protocols very fast and capable long distances. Like the RS-422, however, other wires are required to exceed half duplex communication between peers, which can be limiting and costly.
Above the number of recommended standards, several companies also developed a number of different types of serial protocols for use with specific products, which also contributed to other development. These types include the use of the main device and one or many slave devices connected to the serial bus. One such type is known as Microwire ™ created by National Semiconductor®. It is a type of main and slave, where the main device sets the clock for synchronized communication with a slave device. Like Master to Microwire ™ Slaves, serial protocols, developed by Motorola® Furtje, have added more masters who can communicate with multiple slaves in full duplex.