I connected an infrared receiver to a USB port ... (the last line of dmesg tells device file)
$ dmesg [10496.596063] usb 7-2: new full-speed USB device number 2 using uhci_hcd [10496.751112] usb 7-2: New USB device found, idVendor=0df7, idProduct=0620 [10496.751117] usb 7-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [10496.751120] usb 7-2: Product: USB-Serial Controller [10496.751124] usb 7-2: Manufacturer: Prolific Technology Inc. [10496.787441] usbcore: registered new interface driver usbserial [10496.787467] usbcore: registered new interface driver usbserial_generic [10496.787483] usbserial: USB Serial support registered for generic [10496.795104] usbcore: registered new interface driver pl2303 [10496.795129] usbserial: USB Serial support registered for pl2303 [10496.795160] pl2303 7-2:1.0: pl2303 converter detected [10496.807238] usb 7-2: pl2303 converter now attached to ttyUSB0
Then I went on to try it ...
$ sudo cat /dev/ttyUSB0
but no output, simply hangs. Even though, as I press any button on my remote control, the infrared receiver device's LED flashes, so that does seem to work.
Why could that be?
the above command quits when I remove device from USB port and prints "cat: ttyUSB0: No such device", and dmesg prints 3 lines:
[13707.264086] usb 7-2: USB disconnect, device number 2 [13707.264894] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0 [13707.264915] pl2303 7-2:1.0: device disconnected)
with the device files for keyboard this works, eg:
$ sudo cat /dev/input/by-id/usb-USB_USB_Keykoard-event-kbd
produces many weird characters on the console as I press any key the keyboard
- same happens on other USB ports too