Do not tell me where you can see a simple example of working with a com port? Also, is it possible to turn the LED on and off at the com-port of delphi?

    4 answers 4

    Here is the component and description with examples for working with ComPort. simple ignition of the LED, as with LPT by ComPot does not work out, since ComPort is a serial port, and LPT is parallel. Yes, and the current will not stand COM COM.

    • Do not tell me how you can turn on and off the LED at the LTP port from delphi? - Sarvar
    • Duck you LPT or whom you need? LPT has a good Inout32.dll library, it exports 2 functions: write to port and read from port. - SoftR
    • I want to control external devices using Delphi. For example, turn on and off the LEDs or control the motors. - Sarvar
    • one
      Well, all the same for the management of external peripherals will be easier to use LPT. And how to help you? I do not know your knowledge of programming, as the task is not difficult. Here is an article that describes in some detail the principle of working with LPT with Delphi - SoftR
    • THANK YOU VERY MUCH!!! - Sarvar

    LPT port is best suited for ignition of LEDs. For com port at no additional cost, nothing will come of it. Well, except that 1 LED light :)

    • Well, why not come out? And why one? Although the use for com port is not the best. - Alexey Kotov
    • Do not tell me how you can turn on and off the LED at the LTP port from delphi? - Sarvar

    You can try to take advantage of this . About LED - I mean how to connect the LED to the port? You can try through a banal ballast. If a special brightness is not needed, then it will do. Changing the pulse ratio can be controlled by brightness. Consider only the amplitude of the signal at the port output (-12 ... + 12 V).

    • Do not tell me how you can turn on and off the LED at the LTP port from delphi? - Sarvar

    Everything has been around for a long time at DelphiKingdom:

    In short, comports are available in Windows as files named \\.\COM1 , \\.\COM2 so on. Accordingly, the work with them is carried out mainly by WinAPI tools of CreateFile , ReadFile , WriteFile , CloseHandle .

    • Do not tell me how you can turn on and off the LED at the LTP port from delphi? - Sarvar