Re: USB-serial converter with a USB-device connector

On Fri, 3 Jun 2005 13:01:38 +0000 (UTC), Urs Beeli wrote:

> We are currently redesigning one of our machines that only has RS-232
> interfaces and out marketing wants us to support USB as an interface. The
> redesigned interface board will contain an USB device interface but will not
> be available soon enough for the suits :-)
>
> So as an iterim solution we are looking into ways to make our old product
> 'speak USB' at little cost. What we are thinking about is to use an
> USB-RS232 converter, so at least people can hook up to our machine with a
> USB interface although still use a virtual COM port.
>
> However, the plethora of converters on the market seem to aim at the PC end
> of the problem and all come with 'USB host' connectors (USB A). What we
> would need is such a converter with a 'USB device' connector (USB B) in
> order for our product to offer the correct plug so it can easily be
> connected to a PC using a normal USB A-B cable.
>
> Are there such beasts? If anyone can point me in the right direction I would
> really appreciate that.
>
>
> We are also considering the alternative of 'doing it ourselves' instead of
> buying a finished product. Obviously we would want to use a single-chip
> solution that fully integrates the conversion and ideally also comes with
> windows drivers to emulate the COM port.
>
> Does anyone know of such chips that you can recommend? Controllers with USB
> ports that require programming are not an option as that would mean to much
> implementation effort for us to be worth it.
>
> Thanks for your help.
>
> Best regards
> /urs

Check out the PIC18F4550 from Microchip or the Silicon Labs CP2101, both
are designed to work with virtual UARTS mapping COM ports to USB.

TANSTAAFL however.

Bob

.

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