The background of the 9 pin serial port.The serial port has long been a mainstay of computer technology, and is used to transmit data one bit at a time. In the early days of the personal computer, a majority of printers, hard drives and other peripheral devices communicated via a serial port. Though their use is not as widespread as it once was, serial ports are still an important part of many computing infrastructures.The first serial ports were DB-25s and had 25 pins. These were bulky and were replaced by the more space efficient DB-9 with its nine pins. Serial ports are controlled by a special chip - UART (Universal Asynchronous Receiver Transmitter), which are found on the computer’s motherboard or an expansion card.The RS232 protocol and related RS232 pinout were adopted as standard for serial ports and 9 pin serial connectors. Here is the layout and function of the 9 pins: 2.

USB to RS232 (9-pin Male) Cable. 1 x USB to RS232 Cable. Support the RS 232 serial interface. Run the driver installer program before plugging in the USB to Serial adapter. USB specification: 1.1 and 2.0 compliant.

HP/LP Filter. Midi automation.You can here.Related: Here’s a list of the Plugins. It’s a Free Tryout Pack of Indian Kontakt Instrument andwave/Rex Samples.The pack was created out of Products available at CryptoCipher and Some other Rare Indian Instruments.Here’s the list of instruments;. Swar systems download. Envelope and micro-detuner. Crypto Cipher Free Sample PackAvailable for Windows and Mac.

Modern Uses of Serial PortsAt one time the serial port was the most common type of connection used for personal computers and peripheral devices. While most personal consumer devices now favor a form of USB connection, serial ports are still widely used as the connection type in scientific and industrial equipment. They are also still often used in modems.Some areas where serial ports are still commonly employed are in devices that monitor industrial measurements such as temperature and pressure. The slower speeds of the serial ports and connectors are still sufficient for these uses. In many cases, legacy equipment would be very expensive to replace and will remain in place until it is no longer of any value.Though many modern computers do not come equipped with a serial port, converters are available that allow you to use the resident USB port on your machine to connect to serial components. Why is Serial Port Connector Software Important? By employing this software, a single, critical serial device can be shared by the entire company or organization no matter where they are located.Take a case of a scientific instrument that is being used to monitor conditions in a lab in Europe.

Your worldwide staff can access this device as if it were attached to their local machine. Similarly with any other serial device, they can be controlled remotely with no need for physical intervention.This facility makes it even more cost effective to hold on to your legacy serial devices. There is no need to replace devices that are performing the required functions and can also be accessed easily by your global team.

You will find that serial port connector software becomes indispensable to your company.

README for avrlircAvrlirc is Infra-red remote controller receiver for use withsoftware. The receiver is connected to thecomputer via common serial port. The comunication with the LIRC provideshost-based daemon avrlirc2udp and the default. Because of the Avrlirc sendinformation about the length of IR pulses, it can be used with most of theserial interface (e.g. USB-to-serial convertor). Unlike the simplest, where theserial port is used in non-standard way for direct pulse lengthmeasurement.The idea of this project is taken from Paul Fox,with followingdifferences:.

The smallest AVR ATTiny25 microcontroller in DIP 8 package is used. Inthe fact any kind of AVR with at least one timer and with crystaloscillator inputs can be used. The length of IR pulses is measured in multiples of bit rate used forserial comunication (i.e. 26 microseconds for used 38400 baud). Foxharpversion uses multiples of 1/16384 s (same what LIRC UDP driver expects).

The receiver is powered from DTR, RTS lines of the serial port. To meet previous requirements slightly modified foxharp's avrlirc2udpdaemon is used. Time scaling of IR pulses compatible to LIRC UDP driveris made in daemon and the DTR, RTS serial lines are set to logic one for powerAvrlirc.Remark:The Avrlirc implement software UART and because of that can be easilyconnected to RS232 serial interface without TTL-RS232 convertor (e.g.MAX232).

But the RS-232 standard for the data transmission defines thatlogic one is a positive voltage in the range +3 to +15 volts and the logiczero is a negative voltage in the range -3 to -15 volts. From that followsthat the range between -3 to +3 volts is not a valid RS-232 level.Because of simplicity avrlirc use only positive voltage. Fortunately mostof RS-232 accept this voltage levels. My story 'Why I made avrlirc'My reason for making this receiver was the building the HTPC computer forfamily of my wife. I wanted to have IR receiver, usb wifi dongle and usbwireless keyboard/mouse module all hidden in one box and connected to theinternal motherboard headers. Because of that I bought motherboard withsupport of serial port.Firstly I built simple serial IR receiver 1.

Everything looked fine, Iused irrecord for the learning remote controller keys. I was even able tocreate the configuration file lircd.conf.

There was a little strange,that all IR codes were defined only as RAW! When I wanted to verify learntkeys, LIRC did not recognise any of them. Than I finally realized, thatsomething must be wrong with the serial interface.

My motherboard has onlyone free serial PCIe x1 bus and it has not any paralel PCI bus. So I thinkthe UART chip on the motherboard is connected to the internal serial busPCIe or even USB. But the device on the USB bus cannot immediately notifyCPU about change of the state. It must wait short time until it will beasked. But because of this delay it is not possible to measure short IRpulses. I think this problem will be similar in case of the PCIe serial bustoo.I found project, butI could not easily build because of absence ATTiny2313 in my country.Firstly I modified for ATMega8A, it was working but too big. Than I thoughthow to do smaller and this is the result.

Circuit Diagram and Working ExplanationLinks. Simple Home-brew serial port IR receiver,. AVR-based IR interface for lircd (@foxhapr/avrlirc),. RS-232 (Wikipedia).