I would use HDLC. I have had good luck with it in the past. I would for a point to point serial just use the Asynchronous framing and forget about all of the other control stuff as it would probably be overkill. In addition to using HDLC for the framing of the packet. I format … Read more
First check with dmesg | grep tty if system recognize your adapter. Then try to run minicom with sudo minicom -s, go to “Serial port setup” and change the first line to /dev/ttyUSB0. Don’t forget to save config as default with “Save setup as dfl”. It works for me on Ubuntu 11.04 on VirtualBox.
On Windows, if you want to just make the computer make a beep sound: import winsound frequency = 2500 # Set Frequency To 2500 Hertz duration = 1000 # Set Duration To 1000 ms == 1 second winsound.Beep(frequency, duration) The winsound.Beep() can be used wherever you want the beep to occur.
DTR – Data Terminal Ready DSR – Data Set Ready RTS – Request To Send CTS – Clear To Send There are multiple ways of doing things because there were never any protocols built into the standards. You use whatever ad-hoc “standard” your equipment implements. Just based on the names, RTS/CTS would seem to be … Read more
http://lists.berlios.de/pipermail/gpsd-dev/2005-April/001288.html : The idea is to supplement software in sharing a line between incoming and outgoing calls. The callin device (typically /dev/tty*) is used for incoming traffic. Any process trying to open it blocks within the open() call as long as DCD is not asserted by hardware (i.e. as long as the modem doesn’t have … Read more
If you are developing for Windows, the com0com project might be, what you are looking for. It provides pairs of virtual COM ports that are linked via a nullmodem connetion. You can then use your favorite terminal application or whatever you like to send data to one COM port and recieve from the other one. … Read more
The /sys filesystem should contain plenty information for your quest. My system (2.6.32-40-generic #87-Ubuntu) suggests: /sys/class/tty Which gives you descriptions of all TTY devices known to the system. A trimmed down example: # ll /sys/class/tty/ttyUSB* lrwxrwxrwx 1 root root 0 2012-03-28 20:43 /sys/class/tty/ttyUSB0 -> ../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.4/2-1.4:1.0/ttyUSB0/tty/ttyUSB0/ lrwxrwxrwx 1 root root 0 2012-03-28 20:44 /sys/class/tty/ttyUSB1 -> ../../devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.3/2-1.3:1.0/ttyUSB1/tty/ttyUSB1/ … Read more
I’m adding this solution for people who make the same mistake as I did. In most cases: rename your project file ‘serial.py’ and delete serial.pyc if exists, then you can do simple ‘import serial’ without attribute error. Problem occurs when you import ‘something’ when your python file name is ‘something.py’.
I wrote this a long time ago (from years 1985-1992, with just a few tweaks since then), and just copy and paste the bits needed into each project. You must call cfmakeraw on a tty obtained from tcgetattr. You cannot zero-out a struct termios, configure it, and then set the tty with tcsetattr. If you … Read more
Complementing the @slonik’s answer. You can test socat to create Virtual Serial Port doing the following procedure (tested on Ubuntu 12.04): Open a terminal (let’s call it Terminal 0) and execute it: socat -d -d pty,raw,echo=0 pty,raw,echo=0 The code above returns: 2013/11/01 13:47:27 socat[2506] N PTY is /dev/pts/2 2013/11/01 13:47:27 socat[2506] N PTY is /dev/pts/3 … Read more