USB TO RS-232 convertor with out needing driver

Discussion in 'Embedded Systems and Microcontrollers' started by Izhar Ul haq, Aug 11, 2015.

  1. Izhar Ul haq

    Thread Starter New Member

    Aug 11, 2015
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    I need USB (Standard-B) to RS-232 convertor which can work with out any driver because there is no PC/Laptop involve in the comm.
    Application :To transmit Digital data from vacuum gauge model DPG-202 (USB Port) to PLC Fatek FBS-60MCT (with RS-232 PORT). I have one convertor but it need driver to be install on PC. But in my case there is no PC, only vacuum gauge transmitter and PLC.
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I assume you mean without the driver P.C. driver?
    You could try something like this as a simple direct conversion, using a MAX232.
    [​IMG]

    Max.
     
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  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Ain't gonna happen without a PC, Single-Board PC, Raspberry Pi, or some other "PC equivalent"!
     
  4. tshuck

    Well-Known Member

    Oct 18, 2012
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    You would need a device to act as the USB host (no easy task in an embedded system), interpret the data, and send it out over RS-232.

    Other than using a SBC with some custom firmware, I know of nothing that fits the bill.
     
  5. Papabravo

    Expert

    Feb 24, 2006
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    That'll sure pop the USB port if you plug it into one -- dangerous suggestion for noobs who have no clue.
     
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  6. Izhar Ul haq

    Thread Starter New Member

    Aug 11, 2015
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    Pl suggest me some easy and practical solutions. Thanks
     
  7. Papabravo

    Expert

    Feb 24, 2006
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    There are no easy and practical solutions because USB is much more than a physical layer specification. The protocol requires the capabilities of a processor plain and simple. Your quest is a complete and total pipe dream.
     
  8. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    I though I did? SBC or RasberryPI
     
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  9. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Possibly? Yeah. Easy? That depends on how lucky you get.

    A device such as yours is a USB slave, and it needs a USB master to communicate. There are microcontroller devices that will act as a master you can buy for a few bucks. PIC32 devices can act as a master for example.

    That just leaves you 50 - 100 bucks for a programmer.

    Now the "lucky" part: you will need to find a code example of a master that works with your specific device. "Lucky" means you find an example to adapt. That way you might be done by Christmas.

    A better way is to start with a sensor that already has the RS232 output you want to work with.
     
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  10. be80be

    Senior Member

    Jul 5, 2008
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    Where's the usb come from
     
  11. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    be80be likes this.
  12. be80be

    Senior Member

    Jul 5, 2008
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    Yep and pic chip to read the 4-20 line.
    I think we need to see what the OP has maybe he need to find out where and what added a USB plug to it.
     
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