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Interfacing a Barcode Reader Through Usb with Pic18f4550
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altanonat



Joined: 07 Feb 2011
Posts: 21
Location: Turkey

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PostPosted: Tue Feb 22, 2011 2:09 pm     Reply with quote
PCM programmer wrote:
How do you propose to make the USB-to-RS232 cable work as a USB host ?
All the cables that I have seen for sale, are USB slaves. They must
plug into a USB connector on a PC. The PC is the USB host.


I am thinking of using a converter like this

http://www.scienceprog.com/diy-usb-to-rs232-adapter/

I mean, I will connect usb barcode reader to the usb side of the converter then I will connect rs232 side of the converter to the pic. The question is, such a thing is possible?

In the user manual of there are some barcodes to program barcode reader. One of the barcode in this section is to select the connection type(usb, rs232 etc.) However the problem is I need to do this without changing the cable in barcode reader.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Feb 22, 2011 2:42 pm     Reply with quote
That product uses the Silabs CP2102. That chip must plug into a USB host.
That chip is not a USB host. Look at the diagram on page 4 of
this Silabs document. They show this very clearly:
http://www.silabs.com/Support%20Documents/TechnicalDocs/CP210x_CP211x_OverviewTechnical.pdf

I read the first page of this thread. People have been telling you this
over and over again. They told you to use the FTDI Vinculum chip, or a
PIC32, etc., chip that can be a USB host. I'm done. I'm not going to
try to convince you any more. See this Microchip video:
http://www.microchip.com/microchip.webcontent.provider/Video.aspx?id=ljF4KQ2mfD0
altanonat



Joined: 07 Feb 2011
Posts: 21
Location: Turkey

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PostPosted: Tue Feb 22, 2011 3:14 pm     Reply with quote
PCM programmer wrote:
That product uses the Silabs CP2102. That chip must plug into a USB host.
That chip is not a USB host. Look at the diagram on page 4 of
this Silabs document. They show this very clearly:
http://www.silabs.com/Support%20Documents/TechnicalDocs/CP210x_CP211x_OverviewTechnical.pdf

I read the first page of this thread. People have been telling you this
over and over again. They told you to use the FTDI Vinculum chip, or a
PIC32, etc., chip that can be a USB host. I'm done. I'm not going to
try to convince you any more. See this Microchip video:
http://www.microchip.com/microchip.webcontent.provider/Video.aspx?id=ljF4KQ2mfD0


Anyway, it will be difficult to understand what you are trying to tell me, without practicing. I will give it a try.

Thank you all, thank you very much for your patience and help. All comments appreciated.
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