Infrared port and work with it. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / infrared technology

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What is the infrared port for? This device allows you to create a stable connection between your computer and other devices (equipped with infrared ports) without the use of wires. For example, it could be a scanner or printer. Although now most users purchase such a device to connect a desktop computer with a pocket computer or, which happens much more often, a cell phone. The last two devices have a fairly primitive input system and, of course, its expansion increases the comfort of working with information. The mobile phone has become a completely affordable device for most computer users. The infrared port, which many phone models are equipped with, allows you to edit the contents of the device's address book through an ordinary computer. You can easily change the logo on the display or set a ringtone.

A rather interesting feature that appears to the owner of a mobile device is network monitoring, which will provide the most comprehensive information on the network. It is impossible not to mention such a service of almost all cellular operators as mobile Internet. In this case, you can access the World Wide Web through your mobile phone. In other words, you become Internet users at any point where the operator you need operates. This is quite expensive, but in some cases there are no alternatives to solve this problem. Let's take a closer look at this wonderful device.

Types of IR ports (by connection):

1.		on the IrDA connector of the motherboard,
2.		to a standard 9-pin COM connector
3.		and on USB.

Devices of the second and third types are universal. In other words, if you buy such an IR transceiver, it will install on your computer without any complications. If you like the IR port that connects to the motherboard IrDA connector, then problems may arise. Read the instructions carefully and consult the seller. For example, ASUS's IR port only works on a motherboard from the same manufacturer. Very convenient IR ports are made by one of the Chinese companies (there is no manufacturer's name on the plastic bag). The connector for connecting to IrDA is made according to the “assemble me yourself” principle. On the one hand, it clearly lacks mechanical strength, and inserting it into the motherboard connector is very difficult. But on the other hand, you can easily, without resorting to a soldering iron and tweezers, assemble the required connector, thereby ensuring the necessary “pin” compatibility. This flexibility of the solution makes it a very attractive purchase. Although the quality of Chinese infrared ports... Let's not talk about the bad. In the future we will talk about the characteristics of such devices.

Working conditions

IR communication devices can not be called very capricious, but still you need to talk a little about the conditions for their operation. First of all, you should know that the wavelength of infrared ports is in the range from 850 to 900 nm. Most often, this value is 880 nm. So organizing strong interference is a fairly simple matter. Let's start with examples:

1. The windows of the apartment, located on the fifth floor, face west. Towards evening, the IR receiver/transmitter stopped seeing a cell phone equipped with a similar system. This bundle was on the table and was not covered by anything. The cause of the interference was found without any problems. The bright spring sun was to blame for everything. When working with IR devices, beware of direct sunlight.
2. In the evening, when the fluorescent lamp was turned on, the situation repeated itself. However, it is worth noting that there was still a connection, but it was interrupted very often. The fluorescent lamp must be covered or turned off while IR devices are operating.
3. The TV, which is located in close proximity to the desktop, is equipped with a remote control. When switching channels or any other manipulations with the “sloth”, the working program regularly displayed a message that an extraneous IR device was operating in the immediate vicinity and required that it be turned off. Whether this interfered with data transmission or not is unknown, but until the remote control was removed (you can read “was turned off”), nothing could be done with the program. When working with an IR device, remove any other IR emitters within the range of the IR port.

Exclude all sources of IR waves in the 850-900 nm range from the line of sight of the IR receiver. Reflected waves can cause problems, but to a lesser extent. In a word, it is impossible to foresee all interference, but it is always possible to remove their cause. The operating distance between two IR devices should not exceed one meter. Otherwise, the system will be unstable. The directional diagram of the infrared port, which is indicated in the instructions for it, to put it mildly, does not stand up to criticism. Try to place the devices directly opposite each other. Foreign objects placed between the IR port and the operating device will not contribute to better performance. There have been cases when they tried to connect a cell phone in a case via the infrared port to a computer. Nothing worked until the translucent cover was removed.

connection

Connecting an infrared port to a personal computer is quite simple. But in any case, it is recommended to spend ten minutes carefully studying the instructions for the device. Even if you don't learn anything new from it, you will feel confident during installation.

Hardware

Connect the IR port to the COM port connector. Remember the COM port number - it will be useful to you in the future. When connecting the IR port to the IrDA connector of the motherboard, unscrew the case of your system unit and, after reading the description of your motherboard, insert the connector (four-pin ruler) into the desired socket. The first wire is marked on the board with the number 1 or indicated in the description of the motherboard. The first wire of the IR port connector is color coded. Remove the rear plug to a free space and you can assemble the body. Connect the flex cable connector with the IR receiver/transmitter to the connector on the cap. The socket and connector are very similar to the PS/2 connector.

The software part

Here is a description of the software settings for the MS Windows 98 operating system. For other Microsoft operating systems it is similar. It is possible to connect the infrared port to computers with other operating systems, but the description of the infrared port states: “Designed to work with operating systems Windows 95 and higher.” Experiment, maybe you will succeed.

When you set the IR port to COM, you'll have happy sailing. The device comes with a CD, from which installing drivers will not be difficult. Correctly set the port number to which the IR port is connected. See if the COM port is occupied by another device, such as an internal modem. Also check the BIOS settings for the parallel port - it should be set to ECP mode, not Normal or SPP (default).

When installing an internal infrared port, it is worth doing a little more manual manipulation. First of all, enter the BIOS and enable the second COM port. Typically, below there is an option to enable IrDA. Activate it. Next, establish a half-duplex connection. If your BIOS contains other settings, then set them to default mode. There will be problems - read the instructions and experiment with the settings. You cannot cause any harm or physical damage to your computer.

Boot the operating system. If you did everything correctly, the new device will be detected by the system. Next, you will be asked to select a device type. To be on the safe side, do this manually. Select "IR DEVICES" and then the standard device type. Set a virtual port and remember its number. You will need it to configure most programs. The "Properties: System" menu will have one more item - "Infrared communication devices".

Reload the machine.

After this, an icon in the form of a flashing light will appear in the lower right corner.

Once you open it, you will see the IR communication properties.

Among all the settings, it is worth highlighting only “Modes”. Here you can enable IR communication and set the time after which the IR port will search for IR devices in the line of sight. The "Limit baud rate to:" option can be disabled.

Now, if you place another activated IR device within the range of your IR port, you will hear a sound and see something like this on the screen:

That's it, your infrared port is completely configured, now you can use it. For example, send a picture from your phone to your computer. Next, we invite you to look at the most fashionable and popular use of an IR port device in conjunction with a mobile phone - Mobile Internet.

Mobile Internet

Most cellular network operators operating in the GSM-900/1800 standard offer such a service as “Mobile Internet”. What it is? Using a cell phone equipped with an IR receiver/transmitter and modem, you can access and use the World Wide Web as if you were using a regular dial-up connection. The advantages of such a network login are obvious. First of all, you untie yourself from annoying telephone wires and become mobile (if you use a laptop). But networking via a mobile phone has its drawbacks. We recommend that you find out in advance how much (in monetary terms) such entertainment will cost you. The second disadvantage is the speed of mobile Internet. It is 9600 bps and no more. With the introduction of new technologies, this figure may soon increase. Setting up mobile Internet does not take much time. Here is the order of your actions. Make sure your cell phone has an infrared port and a modem. Turn on the infrared port on your mobile phone. After that, place it within the range of the infrared port connected to the computer (about 1 m).

Now we need to configure the modem built into the phone. To do this, you need to go to the "Settings" menu, then "Modem" and manually install the "standard 19200 modem" (if you have a special driver for your cellular modem, then install it). During installation, do not forget to specify the correct virtual port that was created when you connected the infrared port to your computer. That's it, modem setup is complete. Reboot the system. To establish a connection, you need to create a “New Connection” (you can find out the parameters for it from your cellular operator). Internet via cell phone is at your disposal. Mobile Internet is quite an important and interesting addition to your computer.

Instead of a conclusion

Infrared communication between a computer and other devices operates over a relatively short distance. However, its capabilities are widely used among mobile technology. Most likely, in the near future, communications using IR rays will give way to more advanced types of communications (for example, Bluetooth - several tens of meters). But so far none of the motherboard manufacturers have abandoned IrDA, and you can buy an IR port with peace of mind. Although, before you make a purchase, make sure that your phone and computer can transmit data in the infrared range. We hope that after reading this article, you will be able to select and enable the infrared port without any problems.

Partially used materials iceinet.ru

Publication: cxem.net

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