Hi fellows,
I will try to give further information related to my problem.
I am facing difficulties in order to send USB commands to an RFID reader.
This is the command reference of the device:
https://github.com/mti-rfid/RFID_Explorer
I am working with the MTI RU-824 model.
The manufacturer of the device only provide a driver for Windows (using
.Net), but we need to run the device on Linux. That's why I need to write
few lines of code in Python as a new "driver".
I am using PyUSB for accessing the device, and this is few lines of my code:
============================================================================
import usb.core
import usb.util
import sys
VENDOR_ID = 0x24e9
PRODUCT_ID = 0x0824
device = usb.core.find(idVendor=VENDOR_ID, idProduct=PRODUCT_ID)
if device is None:
sys.exit("Could not find Id System Barcode Reader.")
else:
print 'Device detected'
device.set_configuration()
cfg = device.get_active_configuration()
interface_number = cfg[(0, 0)].bInterfaceNumber
alternate_setting = usb.control.get_interface(device, interface_number)
usb_interface = usb.util.find_descriptor(
cfg, bInterfaceNumber=interface_number,
bAlternateSetting=alternate_setting
)
endpoint_out = usb.util.find_descriptor(
usb_interface,
# match the first OUT endpoint
custom_match=lambda e: usb.util.endpoint_direction(e.bEndpointAddress)
== usb.util.ENDPOINT_OUT
)
endpoint_in = usb.util.find_descriptor(
usb_interface,
# match the first IN endpoint
custom_match=lambda e: usb.util.endpoint_direction(e.bEndpointAddress)
== usb.util.ENDPOINT_IN
)
endpoint_out.write('0x01')
print endpoint_in.read(len('0x01'), 1000)
=============================================================================
My question is on the last 2 lines.
I am using endpoint_out to send a command and endpoint_in to read data from
the reader. Am I correct?
The problem is, when I run the code, there is an error message like this:
usb.core.USBError: [Errno 110] Operation timed out
Anyone can give a clue?
Thank you.
Budi
=========================
<boedy.b...@gmail.com> <http://goo.gl/T5NDnD> <http://goo.gl/4xmCrj>
<http://goo.gl/f2Dj7Q> <http://goo.gl/TlJuEd>
<http://goo.gl/d6J1aE> <http://goo.gl/8ezaYx>
=========================
*Please consider the environment *
*before printing this email*
On Sun, Feb 9, 2014 at 1:08 PM, Setia Budi <boedy.b...@gmail.com> wrote:
> Thanks for the USB reading reference, I will read it in order to get some
> basic understanding about USB.
> But if there is anyone who had an experience working with pyusb and and
> kind of RFID reader, I would be grateful to have some advices.
>
> Kindest regards,
>
> Budi
>
> =========================
> <boedy.b...@gmail.com> <http://goo.gl/T5NDnD> <http://goo.gl/4xmCrj>
> <http://goo.gl/f2Dj7Q> <http://goo.gl/TlJuEd>
>
> <http://goo.gl/d6J1aE> <http://goo.gl/8ezaYx>
> =========================
> *Please consider the environment *
> *before printing this email*
>
>
> On Sun, Feb 9, 2014 at 2:01 AM, Ian Daniher <it.dani...@gmail.com> wrote:
>
>> I'm personally a fan of USB in a Nutshell /
>> http://www.beyondlogic.org/usbnutshell/usb1.shtml.
>>
>> If you have the source to the .NET library, you ought to be able to
>> figure out out the supported requests. Have you emailed them for more /
>> better documentation?
>>
>>
>> On Sat, Feb 8, 2014 at 6:11 AM, Wander Lairson Costa <
>> wander.lair...@gmail.com> wrote:
>>
>>> 2014-02-08 5:30 GMT-02:00 Setia Budi <boedy.b...@gmail.com>:
>>> >
>>> > Anyone has an experience to read RFID tags using MTI RU-824 RFID
>>> reader in Python (using pylab)?
>>> > To be honest, I have zero experience with accessing USB devices or any
>>> hardware without and driver. I can easily read the tags using this reader
>>> in C# since the manufacturer provide a library which is only suitable for
>>> .Net.
>>> > However, I need to make the device to be able to operate under linux
>>> and python is the best option for me to start. I have read a bit about
>>> pylab from here: http://pyusb.sourceforge.net/docs/1.0/tutorial.html
>>> >
>>> > My specific question is how to instruct the reader to start reading
>>> and how to get the data from the reader?
>>> >
>>> > At the moment I already have EP (I assume EP stands for EndPoint).
>>> What can I do with this EP?
>>> >
>>> > I know, this can be a silly question, but I am totally new in USB
>>> world.
>>> >
>>>
>>> The best start it to read a basic USB tutorial, so you can learn about
>>> descriptors and transfer types, once you understand the basics of USB,
>>> the PyUSB tutorial will make a lot more sense for you.
>>>
>>>
>>> --
>>> Best Regards,
>>> Wander Lairson Costa
>>>
>>>
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>>
>>
>>
>> ------------------------------------------------------------------------------
>> Managing the Performance of Cloud-Based Applications
>> Take advantage of what the Cloud has to offer - Avoid Common Pitfalls.
>> Read the Whitepaper.
>>
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>>
>
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