Some time ago I have problems with one device.
I was reading 5 bytes and the device sends 6, and I was getting the "time out".

Try ever read 64 bytes (the max lenght of the endpoint).
There are not problems read more that the device sends; but if you try read 16 and
the device sends 17 it gives a timeout.

device.write(0x01, complete_command_packet)
print device.read(0x82, 64, 0, 1000)


Date: Thu, 13 Feb 2014 15:06:08 +1100
From: boedy.bios@gmail.com
To: pyusb-users@lists.sourceforge.net
Subject: Re: [pyusb-users] Reading RFID tag using MTI RU-824 via pylab

I missed one parameter:

device.write(0x01, complete_command_packet)
print device.read(0x82, 16, 0, 1000)

Now I have the same error:usb.core.USBError: [Errno 110] Operation timed out

I need to re-read the command reference manual for the device.

Kindest regards,

Budi

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On Thu, Feb 13, 2014 at 1:48 PM, Setia Budi <boedy.bios@gmail.com> wrote:
I re-read the reference manual for the reader and I made few changes on the data which I need to send.
At the moment I am quite sure about the format of the data which I need to send (header, device_id, command_id, parameters, crc16).
This is the update for the code

======================================================================

HEADER = bytearray([0x4D, 0x54, 0x49, 0x43])
DEVICE_ID = bytearray([0x00])
COMMAND_ID = bytearray([0x03]) # for retrieving the operation mode
PARAMETERS = bytearray([0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00])

command_packet = HEADER + DEVICE_ID + COMMAND_ID + PARAMETERS

checksum = crc16(command_packet)

complete_command_packet = command_packet + bytearray([checksum & 0xff, ((checksum >> 8) & 0xFF)])

device.write(0x01, complete_command_packet)
print device.read(0x82, 16, 1000)

=====================================================================

I found an different error message when the device.read method is invoked.

AttributeError: 'NoneType' object has no attribute 'bInterfaceNumber'

Any idea about the error message?

Kindest regards,

Budi

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On Wed, Feb 12, 2014 at 11:06 PM, Setia Budi <boedy.bios@gmail.com> wrote:
Ok I will give a try tomorrow :)
Thank you for the advice :)

Budi

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On Wed, Feb 12, 2014 at 9:52 PM, Wander Lairson Costa <wander.lairson@gmail.com> wrote:
2014-02-11 20:11 GMT-02:00 Setia Budi <boedy.bios@gmail.com>:
> This is the output for lsusb -v -d 24e9:0824
>
> Bus 002 Device 007: ID 24e9:0824
> Device Descriptor:
> bLength 18
> bDescriptorType 1
> bcdUSB 1.10
> bDeviceClass 255 Vendor Specific Class
> bDeviceSubClass 0
> bDeviceProtocol 255
> bMaxPacketSize0 8
> idVendor 0x24e9
> idProduct 0x0824
> bcdDevice 0.01
> iManufacturer 1 MICROELECTRONICS TECHNOLOGY INC.
> iProduct 2 MTI UHF RFID PRODUCT
> iSerial 3 1326U0002
> bNumConfigurations 1
> Configuration Descriptor:
> bLength 9
> bDescriptorType 2
> wTotalLength 41
> bNumInterfaces 1
> bConfigurationValue 1
> iConfiguration 0
> bmAttributes 0xc0
> Self Powered
> MaxPower 500mA
> Interface Descriptor:
> bLength 9
> bDescriptorType 4
> bInterfaceNumber 0
> bAlternateSetting 0
> bNumEndpoints 2
> bInterfaceClass 3 Human Interface Device
> bInterfaceSubClass 0 No Subclass
> bInterfaceProtocol 0 None
> iInterface 0
> HID Device Descriptor:
> bLength 9
> bDescriptorType 33
> bcdHID 1.11
> bCountryCode 0 Not supported
> bNumDescriptors 1
> bDescriptorType 34 Report
> wDescriptorLength 98
> Report Descriptor: (length is 98)
> Item(Global): Usage Page, data= [ 0x00 0xff ] 65280
> (null)
> Item(Local ): Usage, data= [ 0x01 ] 1
> (null)
> Item(Main ): Collection, data= [ 0x01 ] 1
> Application
> Item(Global): Report ID, data= [ 0x43 ] 67
> Item(Global): Report Count, data= [ 0x0f ] 15
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Logical Minimum, data= [ 0x00 ] 0
> Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
> Item(Local ): Usage, data= [ 0x01 ] 1
> (null)
> Item(Main ): Output, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position Non_Volatile
> Bitfield
> Item(Global): Report ID, data= [ 0x52 ] 82
> Item(Global): Report Count, data= [ 0x0f ] 15
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Logical Minimum, data= [ 0x00 ] 0
> Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
> Item(Local ): Usage, data= [ 0x01 ] 1
> (null)
> Item(Main ): Input, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position Non_Volatile
> Bitfield
> Item(Global): Report ID, data= [ 0x42 ] 66
> Item(Global): Report Count, data= [ 0x17 ] 23
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Logical Minimum, data= [ 0x00 ] 0
> Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
> Item(Local ): Usage, data= [ 0x01 ] 1
> (null)
> Item(Main ): Input, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position Non_Volatile
> Bitfield
> Item(Global): Report ID, data= [ 0x41 ] 65
> Item(Global): Report Count, data= [ 0x3f ] 63
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Logical Minimum, data= [ 0x00 ] 0
> Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
> Item(Local ): Usage, data= [ 0x01 ] 1
> (null)
> Item(Main ): Input, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position Non_Volatile
> Bitfield
> Item(Global): Report ID, data= [ 0x49 ] 73
> Item(Global): Report Count, data= [ 0x3f ] 63
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Logical Minimum, data= [ 0x00 ] 0
> Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
> Item(Local ): Usage, data= [ 0x01 ] 1
> (null)
> Item(Main ): Input, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position Non_Volatile
> Bitfield
> Item(Global): Report ID, data= [ 0x45 ] 69
> Item(Global): Report Count, data= [ 0x17 ] 23
> Item(Global): Report Size, data= [ 0x08 ] 8
> Item(Global): Logical Minimum, data= [ 0x00 ] 0
> Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
> Item(Local ): Usage, data= [ 0x01 ] 1
> (null)
> Item(Main ): Input, data= [ 0x02 ] 2
> Data Variable Absolute No_Wrap Linear
> Preferred_State No_Null_Position Non_Volatile
> Bitfield
> Item(Main ): End Collection, data=none
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x01 EP 1 OUT
> bmAttributes 3
> Transfer Type Interrupt
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0040 1x 64 bytes
> bInterval 1
> Endpoint Descriptor:
> bLength 7
> bDescriptorType 5
> bEndpointAddress 0x82 EP 2 IN
> bmAttributes 3
> Transfer Type Interrupt
> Synch Type None
> Usage Type Data
> wMaxPacketSize 0x0040 1x 64 bytes
> bInterval 1
> Device Status: 0x0001
> Self Powered
>

To begin with, your former code can be summed up to this (with latest
git PyUSB):

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()

device.write(0x01, [0x01]) ---> you probably meant [0x01] or '\x01'
instead of '0x01'
print device.read(0x82, 64, 1000)

If you are still getting a read timeout, that is probably because the
0x01 command means nothing to the device.

--
Best Regards,
Wander Lairson Costa

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