When you are referring to RS-232, RS-422 or RS-485, you are having the thought of a legacy in serial communication protocols. They still find usage in a huge number of applications, even though the world has taken a gigantic leap in technology.

Let's turn our attention to fiber optics! It is a long distance telecommunicating and networking tool. Do our older protocols, RS-232, RS-422 or RS-485, find any usage in this system of communication? If you survey certain research papers, these USBs are quite useful in such form of communication. This is why you would find a number of projects where fiber optic media converters would find its use.

We already know that RS-232 protocol makes use of distinct levels of voltages with respect to the ground, if we wish to go point-to-point at the slow speeds over very shorter distances. RS-422 protocol makes use of twisted pairs. They look for quicker signals covering longer distances. It requires positive & negative & positive voltages for operating properly. RS-485 protocol is similar to RS-422. However, it makes use of addressing option for talking to multiple devices. Adapters and converters are used for translation of commands in between your system and the different protocols along with USB, TTL and Ethernet device. If you go through the description thus far, then you would find out that the process requires wires and strands. You need to make sure that connections have been done in a proper manner.

Now, the question, which can arise in your mind, is that what the roles of fiber optics are in this case. Whenever there would be interference from the serial communication protocol speed & distance limitation, they would find usage in the system. Serial communications have no requirement for complex technologies. It has got its own inherent limitations:

· Positive & Negative Signal Requirements

· Huge Voltage Swings

· Signal Interference

There are a number of applications where such issues have been raised.

In case of fiber optics, light takes the place of electricity, as the source for passing signals. This means that you are getting higher bandwidth and signal along with internal resistance for radio and electromagnetic frequency interface. Thus expect the usage of fiber optics, where you would find the transfer takes place between serial data protocols and remote locations on short time durations.

There is no doubt that there are limitations for RS-232, RS-422 or RS-485; a lot of them. However, if you can include fiber optics to the entire systems of protocols, Ethernet and USB, these limitations can be easily addressed. There are a number of factors that lead to the popularity of these converters, even in the current technological enhanced world:

· They are available almost everywhere

· They are inexpensive

· They are mature

These factors are good enough for even a person, who is a layman, to opt for these converters, leave aside a person, who is well-qualified and understands the role in no time whatsoever.

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