[SOLVED] How To Read Data Over /dev/ttyUSB0
So...I am using a serial device connected to a Keyspan Serial-to-USB adapter and plugged in to my computer's USB port. The device is constantly sending 115200 baud data over UART, with no parity, 8 data bits, 1 stop bit, no flow control, and no handshaking. I can read the data just fine on my Windows machine (once I install the Keyspan driver). On Arch64, I notice that when I plug it in, /dev/ttyUSB0 shows up so I believe that means the kernel is recognising the device and already has drivers to handle it. I would like to simply see the output of the device through my terminal emulator so I have written the following script....
stty -F /dev/ttyUSB0 115200 cs8 -cstopb -parenb
while true; do
read LINE < /dev/ttyUSB0
echo $LINE
done
When I run this script as root, however, I get no output. I have also tried appending "-icanon min 1 time 1" to the stty arguments list but also to no avail. Can anyone help? Thanks!!
Last edited by tony5429 (2009-10-30 20:59:30)
Thanks, all for the responses!
perbh: I wasn't sure exactly how to implement your suggestion. If the cat line doesn't use the variable, "$LINE", how can "echo $LINE" work? I am probably missing something simple...
Well, I have had a little success. The following script creates blank lines whenever data comes in through the usb device. Basically the device sends FFT data whenever it hears a sound which is greater than a certain threshold, so when I snap my fingers near it I see the FFT data show up in Terminal on Windows. Now, with the script below, if I snap my fingers my Linux machine outputs a bunch of blank lines so basically I just see my linux terminal emulator scrolling whenever I snap my fingers Does anyone have any ideas how to get the actual data on Linux? Thanks again!
stty -F /dev/ttyUSB0 115200 cs8 -cstopb -parenb
while true; do
read -n 8 LINE < /dev/ttyUSB0
echo $LINE
done
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