SerialPort (RS-232 Serial COM Port) in C# .NET This article explains how to use the SerialPort class in .NET to read and write data, determine what serial ports are available on your machine, and how to send files. It even covers the pin assignments on the port itself. Example Code: using System; using System.IO.Ports; using … Read more
The EnumSerialPorts v1.20 suggested by Nick D uses nine different methods to list the serial ports! We’re certainly not short on choice, though the results seem to vary. To save others the trouble, I’ll list them here and indicate their success in finding the com0com ports on my PC (XP Pro SP2): CreateFile(“COM” + 1->255) … Read more
Sysinternals’ Portmon works only on 32-bit versions of Windows. It does not support 64-bit (probably its driver is not signed). From the Portmon homepage: Runs on: Client: Windows XP (32-bit) and higher (32-bit). Server: Windows Server 2003 (32-bit) and higher (32-bit).
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
The settings you need are “Local echo” and “Line editing” under the “Terminal” category on the left. To get the characters to display on the screen as you enter them, set “Local echo” to “Force on”. To get the terminal to not send the command until you press Enter, set “Local line editing” to “Force … 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.
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