The RS232 circuit connected to my PC, but could not read any pulse.

Discussion in 'The Projects Forum' started by Sabryg, Sep 10, 2015.

  1. Sabryg

    Thread Starter New Member

    Sep 8, 2015
    3
    0
    [​IMG]

    Dear Mr. Morse,

    I tried to build the circuit you mentioned in this post and connected it to my PC but could not read any pulse.
    I did not use an optocoupler for the signal instead I used 5 VDC power supply as a source to produce a single pulse and test.
    I think may be this is problem.
    Please advise.

    Thank you
    Sabry Kozman


    Mod Edit : please don't hijack other member's post.
    This thread was split from Pulse counter to PC file -- and asked for #2.
     
  2. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    Im not really sure what you mean by using a 5 volt signal as a pulse source, are you just connecting 5 volts to the serial ports pin #9? It has to be low, then go to 5 volts, you cannot leave it just floating. what application do you have running on the PC to accept the pulse?
     
  3. Sabryg

    Thread Starter New Member

    Sep 8, 2015
    3
    0

    I used a DC power supply instead of the 5V DC opto coupler at the input. I used the circuit from you earlier post attached. I used the VB example you posted also with this circuit.
     
  4. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    are you still using the pull down resistor shown in the diagram tied to pin #5 of the serial port? You will need to keep the ring indicator line #9 low with the resistor tied to ground.
     
  5. Sabryg

    Thread Starter New Member

    Sep 8, 2015
    3
    0
    Dear Mr. Morse

    Can you please inform me about the model and part number for the slotted disk sensor?
     
Loading...