| Re: USB dlm for IDL? [message #69930 is a reply to message #69819] |
Tue, 23 February 2010 14:42  |
Marco
Messages: 5
Registered: April 2009
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Junior Member |
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USB is not a port like a serial port out of which you can pump arbitrary
data. There must be a device plugged into it. The OS will recognize that a
device has been plugged in and query it. It will then find out if it has a
driver for that device. If it does, it will then load the driver. Once the
driver is successfully loaded, a user can access the device. How that
device is accessed depends on the driver. If the device is a serial device
you will be able to talk to it as a serial port. If it is a disk, it will
look like a disk. If it is a camera it might look like a camera or a disk
depending.
In any case, you need to have a USB device and a driver for it. In your
case, if you are currently using a serial port, get a USB-to-serial device.
Then, you just talk to it like a serial port just as you have been.
If the device has a USB interface that is not a standard interface, the user
documentation will tell you how to talk to it in C or C++. Then you can
build a DLM if you need.
Marco
UCO Lick Observatory
Laboratory for Adaptive Optics
"tegus" <tegusbillharris@gmail.com> wrote in message
news:9b7703de-6ad1-4f24-a709-bbe3c7d1ac77@c16g2000yqd.google groups.com...
> Hi,
>
> I am currently using my serial port, via IDL, to command a motion
> controller. I works fine with the serial port dlm from the ITT code
> library. Of course, I want to control more stuff, so it seemed USB was
> the way to go, but before attempting to build my own USB dlm, I was
> hoping someone has already done so.
> Possibly Ron Kling's "generic interface for calling Windows DLL
> functions directly" on his Kilvarock website could be one approach,
> but I don't know much about Windows DLL functions.
> I'm running 7.0 on 64 bit Win7.
>
> Thanks!
> Bill
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