Computer infrared serial port, hardware key. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Computers

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The PC IR serial port or dongle is based on the COM2 serial port architecture, i.e. on the architecture of the universal asynchronous transceiver UART2 (Universal Asynchronous Receiver Transmitter 2). When the serial IR port support is enabled in the BIOS, UART2 operates in half-duplex point-to-point mode using the IrDA (Infrared Data Assotiation) protocol with a data reception / transmission rate of 2400 ... 115200 bps (bit per second), and higher, up to 16 Mbit / s. The speed depends on the iron, i.e. from the BIOS and from the IR transceiver.

IR transceivers for the serial IR port of a PC are now produced by many companies. As a rule, Hewlett-Packard HSDL-NNNN, Vishay TFDxNNNN, etc. chips are used for this. One of the possible options is shown in fig. 1.1.

Fig. 1.1.

• Note 0. It is no longer necessary to repeat such a design yourself, it is much easier to purchase a finished product.
• Note 1. Personally, because of its simplicity and originality, I liked the scheme more IrDA port adapter for computer". It almost completely corresponds to the internal structure of Vishay TFDxNNNN microcircuits, but is much simpler (Hewlett-Packard HSDL-NNNN microcircuits do not have blocking for receiving their own IR signals).
• Note 2. Some motherboards have "non-standard" 4-pin, 6-pin, and other connectors for connecting an IR transceiver.
• Note 3. Some motherboards need an IR transceiver with different circuitry; all 5 pins of the connector are used.
• Note 4. IR port emulators that connect to COM or USB port have a different interface and their own software.
• Note 5. According to the IrDA standard, IR communication devices use a narrow IR range of 850...900 nm with a maximum emission of about 880 nm; provide stable bidirectional communication at a short distance of 1...100 cm at a deflection angle of up to 30°. It should be noted that strong interference to the operation of IR devices can come from incandescent lamps, direct sunlight, TV-video equipment, etc.

To activate the serial IR port, it is necessary to enable its support in the BIOS, i.e. "Chipset Features Setup / UART2 Use Infrared / IRRX Active Lo, IRTX Active Hi" or look for something like "COM2 / IrDA".

Author: Alexey Stepanov; Publication: cxem.net

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