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If you are reading this article, you know that there's still a need for serial ports in this world. Be it that a device doesn't have USB or needs something USB cannot provide, or that the project simply doesn't warrant the added expense and complexity of USB, serial remains a viable answer for many projects and systems. Add to that the fact that serial allows for longer cables and that RS232/RS422/RS485 are incredibly flexible data communication protocols thanks to the flexibility of the standards themselves and also to the ease with which you can communicate between protocols via converters, and it's no surprise that serial ports are here to stay.

That said, there are a few areas in serial communication where a bit more standardization wouldn't have hurt. How many times have you tackled a seemingly simple serial communication project just to find that you didn't have the right cable and connector? That can happen with USB, too, with its Mini-USB, USB-B, Mini-A and other connector variants, but it's really worst with serial connections where you often have no idea hat to expect. So let's take a look at the various connectors used in RS-232/RS-422/RS-485.

By far the most common serial plugs are the 9-pin and 25-pin D-sub, or subminiature "D" connectors. Each comes in a male and female variety, and each has two rows of pins, 5 and 4 for the DB-9, and 13 and 12 for the DB-25. Older equipment with serial ports usually has the large DB-25 connectors but those have mostly given way to the smaller DB-9. That's because the significantly narrower DB-9 saves valuable real estate, and also because only very few serial connections actually use more than nine leads.

Other commonly used jacks and plugs include the RJ-11 and RJ-45 formats. RJ-11, of course, is what's commonly known as a modem jack, and RJ-45 is generally associated with Ethernet connections. However, RJ-11 has six wires and RJ-45 8, and that is often enough even for complex serial connection projects. RJ-11 and RJ-45 jacks and plugs are inexpensive, reliable, and they use much less space than the DB-9 and DB-25 connectors, so keep them in mind.

One neat thing about all those different serial connectors is that it's very easy to convert from one to the other. Adapters and converters are readily available and if you keep some of the common ones in your toolbox, there won't be any unpleasant surprises when you tackle a project in the field. Oh, and also make sure to carry along some gender changers. While DTEs (Data Terminal Equipment) should use male connectors and DCEs (Data Communication Equipment) female connectors, that's not always the case, and then it's so much easier to just pop in a gender changer than to make or buy a new cable.

The one characteristic of serial communication that can throw a real monkey wrench into a project is when it's not clear which device is configured as a DTE and which as a DCE. That's usually the problem when you seem to have the right cable with the right genders, and yet, no communication. Sometimes both sides are configured as DTE or DCE. That's when you need a null modem, a special adapter that connects the proper outputs to the proper inputs.

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.

Hardware Maintenance Software

Computers have become an important part of life. But do we care for it. You might be say “I clean the computer everyday”. That’s really good but do you remove / delete unwanted files. Both external and internal working of the computer must be checked. External hardware maintenance include cleaning the computer, once in a year inspecting that all cables are attached to the hard drive, floppy drive & optical drive. If there are loose connections, then fix the problem immediately.

For internal maintenance you need to update the computer for periodic updates. Do you have the time to clean the cluttered mess on your desktop? Many of us will say my computer has large memory to store in the data. Yes they might have… but recently if you have witnessed computer working slower than usual or freezing every now and then, paying immediate attention is very necessary. Run the new anti virus version available. In the recent years, computers have been attacked by the viruses and spyware programs that not only affect the software installed in the computer but slowly and gradually eat the hardware components also. Therefore, guys it is time to give it the necessary attention to your computers, update it with the times to avoid any instant breakdown.

There are various hardware maintenance software programs available online (both paid and free of cost). Everyday new programs are added here… so how will you can to know which one is the right one for you. Rarely will you find a computer maintenance management system that works perfectly well on all the hardware. Well hire a professional company that offers competent hardware maintenance facility. They are many companies offering with hardware maintenance and management software. They work on contractual basis and help you in maintaining the computer. If you are considering one for maintaining the systems at home or office, then ask yourself few questions before hiring them:

* What will be the focus of the organization? Will they provide with updates or concentrate more on selling or will they help you in getting most out of on hand technology investment?

* Do they have the team of engineers who can deal with the complicated situations easily?

* Finally when their contract ends they will no longer offer their maintenance services / support and will not force you to extend or upgrade the contract. If necessary you can hire an independent hardware maintenance software company for extending the life of the computer.

* Check out the rates at which they are offering their services to the company.

Computer hardware maintenance software programs are important for well being of your computer. They help in maintaining & managing the various aspects of computer hardware that is difficult to maintain and is time consuming. For more information about the hardware maintenance software, visit http://www.qsgi.com/, now.

About the Author

QSGI provides complete information technology solutions to help corporations to better manage hardware assets, reduce maintenance expenses, build best practices for data security and assure regulatory compliance.

Who would gain from slowly cutting international Internet access in the Middle East?

interesting.
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http://hardware.slashdot.org/article.pl?sid=08/02/04/0158249&from=rss
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magpie....do you see a beard on me?

When you invade you first knock out communications....

30 convictions, over USD 143m seized in counterfeit hardware trading
Washington, May 7: Operation Network Raider, a domestic and international enforcement initiative targeting the illegal distribution of counterfeit network hardware manufactured in China, has resulted in 30 felony convictions and more than 700 seizures of counterfeit Cisco network hardware and labels with an estimated retail value of more than USD 143 million.

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