User manual

ASURO - 23
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5.2.2 Linux
The following operational check is limited to the USB Infrared-Tranceiver and LINUX software.
First of all the IR-Transceiver must be checked, as it will be needed for the next step: the selftest
of the system. For this test connect the IR-Transceiver to a free USB port of your PC by a
USB extension cable. A short beep will con rm that the transceiver was detected by the LINUX
software. To be sure please check in the proc-declaration if the following message is displayed.
foo@bar:/>cat /proc/tty/driver/usb-serial
There is also an entry with the following (‘0’ in our example can also be ‘1’ or ‘2’ etc.):
usbserinfo:1.0 driver:v1.4
0: module:ftdi_sio name:”FTDI 8U232AM Compatible” vendor:0403 product:6001
num_ports:1 port:1 path:usb-00:11.2-1
For test you have to con gure the Minicom at the interface /dev/ttyUSB0 (oder 1, 2 usw...) with the
folowing settings:
• Bits pro Second: 2400
• Databits: 8
• Parity: none
• Stopbits: 1
• Flowcontrol: none
Press “OK” again for con rmation
It is possible that root rights are necesary.
Maybe you need to declare read and write rights for the user or groups for the new device /
dev/ttyUSB?. You can do this with chmod u+rw /dev/ttyUSB0 (oder 1, 2...) or chmod g+rw /dev/
ttyUSB0 (of course again you need the root.ricgts).
Hold the IR-Transceiver at the distance of 10 cm over a white sheet of paper. The component side
must be directed towards the paper sheet.
Press a few keys at your computer terminal.
The terminal programm normally should display the key-symbols. The IR-Transceiver transmits
the key-symbols by IR-Diode (D5), the transmitted signal re ects at the paper surface and is send
back to receiver-IC (IC2), from which it is being returned to the computer. If no symbols or wrong
symbols are being displayed you may carefully turn the trimmer between its extreme left and right
positions. Use a miniature screwdriver and strike a few keys at each position of the trimmer until
the correct symbols are displayed.
Electronics