is any last solution for rs232 to usb

Discussion in 'Embedded Systems and Microcontrollers' started by new_eng, Oct 21, 2011.

  1. new_eng

    Thread Starter New Member

    Oct 20, 2011
    5
    0
    hi
    I have pic programmer rs232

    what i need exactly to change in the circuit to work with caple rs232 to usb

    some one say only add 12v to VPP and another say you need to add
    transistor

    i saw befor ready circuit and it work vary nice with caple but i dont have

    circuit digram

    is any circuit and sultion
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    What kind of programmer is it, and which PIC do you use? I think the simplest solution would be to pick up a cheap PICKIT clone from Ebay. If you are on a budget. If not on a budget get one from Microchip.
     
  3. electronis whiz

    Well-Known Member

    Jul 29, 2010
    519
    27
    there are usb to paralall cords available that use the 50 pin cintronics to conect to the printer. this might help also.
     
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,394
    1,606
    If I understand you, what you need or want is an RS-232 to USB adapter.

    Those exist. Have existed for a long long time now. Mine is so old the manufacture is out of business and I have to look up the drivers on the way back machine.

    I used to use an RS-232 PicStart Plus over a USB to RS-232 converter.
     
  5. nigelwright7557

    Senior Member

    May 10, 2008
    487
    71
    Have you checked your PC for a legacy RS232 connector on the pcb. My motherboard is almost new and has one, I just needed to put a connector on to the back panel for it to work with picstart.
     
  6. new_eng

    Thread Starter New Member

    Oct 20, 2011
    5
    0

    it is JDM programmer
    and i need to program different type ..
    like i6f84a ...877 ..

    is any circuit please

    thanks..
     
  7. t06afre

    AAC Fanatic!

    May 11, 2009
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    I have read many places that JDM and USB to RS232 do not go quite well together. However it would not hurt to try. Check with friends and see if they have some converters you can test. Then get the type/brand that work best.
     
  8. BillO

    Well-Known Member

    Nov 24, 2008
    985
    136
    If you are using a XP or older computer, you can get a USB to RS232 cable for under $3 on eBay. It's not worth building one yourself.

    If you insist on doing it the hard wal, look up the specs on these chips:

    PL2303
    CP2102
    FT232


    These all do USB to RS232 conversion. The FT232 seems to be the currently most popular.
     
  9. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    The problem with RS232 programmers conversion with USB cable is that USB transmits using 1ms long frames, so from a nice fast programming you end up with a very slow programmer. I tried ponyprog with usb-rs232 cable and programming 256 bytes of code took me in the order of two minutes.
     
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