Hi All

Why USB so called "universal serial bus"? why can't RS232 or RS485 or any orther communication cannot provide universal serial communication?


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Best Regards
Dileep Chacko

 

They all transmit serially and diferentially. And you can convert one standard to another. There are some differences. For example RS485 is good for long distances upto 4000 meters is used in Data Adquisition systems also allows upto 32 devices. The RS232 standard is being replaced by the USB which uses lower voltages which make it the most efficient of the 3.

 

USB was developed for computer home users for a lot of different devices, as opposed to straight computer use. They needed a simple name instead of numbers. Firewire was named differently to distinguish between USB and it, but the reasoning was the same (and Firewire sounds sexier).

USB was designed to be easy to use and hard to screw up, unlike the older standards. A consumer plug in, if you will.

 

Hi All

Why USB so called "universal serial bus"? why can't RS232 or RS485 or any orther communication cannot provide universal serial communication?


--
Best Regards
Dileep Chacko

USB was designed to allow a number of different peripherals to be connected using a single standardized interface socket and to improve the direct plugging (hot-plugging) capabilities by allowing devices to be connected and disconnected without rebooting the system. There are innumerable features of the USB but the main feature that stands out is it's versatility and its ability to interface a wide range of peripherals with limited requirement of a device driver. You can refer to the book "USB Port Complete" by Jan Axelson. It gives a detailed account of the USB Port and programming examples based on it.

 

Hi All

Why USB so called "universal serial bus"? why can't RS232 or RS485 or any orther communication cannot provide universal serial communication?


--
Best Regards
Dileep Chacko

The name "universal serial bus" stems from its historical beginnings as a specification designed to provide a mechanism for connector standardisation - basically it was a descriptor for the specification.

Dave