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Feet Length
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One question that often comes up during discussions of the RS232, RS422 and RS485 serial data communication protocols are the speed and distance limits of the various protocols. This directly impacts the choice of protocol and therefore warrants discussion.
To reiterate, from an architectural standpoint, RS-232 is a uni-directional or bi-directional point-to-point link where a single channel is used for "half-duplex" communication or two independent channels are used for two way, or "full-duplex," communication. RS232 can also carry flow control and modem control signals. There are two types of connectors commonly used for serial communication. One has nine pins and one has 25 pins. RS232 signals consist of voltage relative to a common signal ground. A logic zero, also called "space," can be anywhere from 5 to 25 Volts. A logic one, also called "mark," can be anywhere between negative 5 and 25 Volts. This kind of communication is referred to as "unbalanced."
The RS-232 standard defines a maximum speed of just 20 kbps (kilobits per second). That modest speed, however, does not pose a hard barrier as serial connections are routinely much faster (up to 115kbps and more). Unfortunately, it is in the nature of RS232-based communication that interference occurs between adjacent wires. Wire capacitance and inductance limit serial communication speeds and the length of the connection that will still result in reliable communication. As a rule of thumb, an RS232 connection running at full speed should not be longer than 50 feet. In essence, there is a very direct correlation between RS232 speed and distance: the higher the speed, the lower the maximum cable length before errors become too high. It's unclear and unfortunate that the RS-232 standard was not based on the much faster twisted pair technology that even back in the late 1960s had been around for many decades. This was clearly a case where the standard makers did not see past the immediate problem, that of connecting terminals to the very slow modems of the time. So why is RS232 still being used even today? Because it's been around for so long, because it's cheap, and because a lot of handheld devices and instruments still use it.
If RS232's limitations are unacceptable, the solution is often using the RS-422 standard that was designed for higher speed (up to 100kbps) and longer distances (up to 4,000 feet). The maximum data rate of RS-422 is up to 10 mbps over short distances, rivaling Ethernet and USB speeds. How can RS-422 be faster and error-free over much longer distances? Primarily because the standard uses a "balanced" signal on twisted pair wires that is far more immune to interference. This is referred to as "differential" data communication. Ground shifts and most noise is easily recognized and rejected by the receiver. Where does RS-485 fit in? It is used in projects that have the same speed requirements that RS422 can deliver, but also need multiple drivers (as opposed to just one in a RS422 setup).
Are the 4,000 feet maximum cable length and 10 mbps speed for RS-422 and RS-485 hard limits? Not really. There are now transceivers that support up to 10 mbps over short distances, and fiber optics can greatly extend the functional length of serial data communication. Use the proper adapters, converters and transceivers, and serial data communication is far from dead.
Chris Robertson is an author of Majon International, one of the worlds MOST popular internet marketing companies on the web.
Learn more about RS422 Converters.
Metric Conversion is Simple When You Use a Length Conversion Table or Calculator
When traveling overseas from the United States, you will find it handy to print out a length conversion table, or utilize the speed of a length conversion calculator. With only three exceptions, every country in the world uses the metric system, so in everyday transactions that you will have while traveling, you will find that it is helpful to know a little bit about metric conversion so that you can understand and use metric lengths in a more cognizant manner on your trip abroad.
A length conversion table is a chart that you can find online and print out. It will show the conversions from meters to feet, for example, and list from one to as many table pages you wish to print. It can be handy to keep in your coat pocket or purse, so you can refer to it whenever you wish.
Metric conversions can also be performed on a length conversion calculator. These handy devices are found online or within hand-held calculators, and you simply pick the length conversion you wish to make, type in the number you want converted, and then stand back while the calculator does the math for you in record speed. For online conversion calculators you will, of course, need Internet access, so you will want to consider that as you travel.
Of course, all of the length conversion tables and calculators are based on mathematical conversion formulas. The metric system is based on base ten. This means that it is often quite easy to do mental math concerning length conversion, because you are only adding, subtracting, multiplying or dividing the number of units by ten to get the answers you need.
With regard to length, there are some metric terms you will want to know. A meter is similar to our yard, while a centimeter is one one-hundredth of a meter, and a millimeter is one one-thousandth of a meter. On the longer end of the length spectrum, length is measured in kilometers, which is equal to one thousand meters.
Knowing a little bit about length conversion can make you more comfortable when you are out shopping, taking measurements, walking between or calculating map distances, or driving a car on your trip abroad. When you know that the metric system is based on the number ten, the math conversions become fairly easy, but when they are not, you can use a conversion table or calculator instead.
About the Author
Susan Slobac is an avid supporter of extended learning. She is active in helping educators with an interest in teaching internationally, and her experience includes development of metric length conversion curriculum.
how big should my big screen TV be if i have a room that has the length of 11 feet?
I have been looking for a gaming LCD television set for a long time now, and i was previously looking at a 40" but that wont feel right. The length of my room is about 11 feet, and by that distance, what size of the TV should i get? This television is for an xbox, so what size and pixels should my TV include?
Don't make the mistake of gettin a tv too big, Consider a 32 inch and remember your neighbors can live without the noise if you pipe it into your stereo,
Bonadeo Boatworks: Business Development Board Announces Expansion
Bonadeo Boatworks builds custom center console fishing boats and expresses from 31 to 43 feet in length
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