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Common MODEM Communication Problems; Chapter 4, Advanced Serial Programming. Serial Port IOCTLs. Solaris®, Digital UNIX®, Linux®, and most other UNIX operating systems. The biggest difference between operating systems that you will find is the filenames used for serial port device and lock files. This guide is organized into the following. This is a step-by-step guide to using the serial port from a program running under Linux; it was written for the Raspberry Pi serial port with the Raspbian Wheezy distribution. However, the same code should work on other systems.

1. Linux Serial Port Communications
2. Php Serial Port Communication Linux
3. Linux Serial Connection
4. Linux Connect To Serial Port
5. Linux Test Serial Port Communication

1. Welcome to pySerial’s documentation¶. This module encapsulates the access for the serial port. It provides backends for Python running on Windows, OSX, Linux, BSD (possibly any POSIX compliant system) and IronPython. The module named “serial” automatically selects the appropriate backend.
2. My dell dimension 8400 has a serial port on the back. I want to use minicom to interface the serial port on this computer with Ubuntu installed. The output of dmesg grep tty did not give me much useful information however. I could not find anything with the key word 'Serial'.

My dell dimension 8400 has a serial port on the back. I want to use minicom to interface the serial port on this computer with Ubuntu installed.

The output of dmesg grep tty did not give me much useful information however. I could not find anything with the key word 'Serial':

How can I find the serial port, so I can interface my old Terminal Node Controller with minicom? I remember the serial port working just fine on CentOS with the same system.

MaythuxSkyler 440Skyler 440

1 Answer

The output from dmesg is not the result you want you still have to run the command:

The output would be like:

So as shown above The unkwon UART is not taken so you can use ttyS0 ot ttyS1.

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Try this for your system and check.

More if you still use some old Ubuntu version < 14.04 you can use gtkterm which is a simple GTK+ terminal used to communicate with the serial port.

MaythuxMaythux

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Is there any port monitoring tool to watch the packets written on the port? I especially want to check if my program written in Java works so I need some kind of tool to see if my little application is writing the messages to the port. How do I do this?

Michael Mrozek♦DeepakDeepak

9 Answers

I found projects called Linux Serial Sniffer, jpnevulator, and Moni. The first two look like they do exactly what you want. The last one calls itself a monitor, but it actually looks like a standard serial communication program.

Shawn J. GoffShawn J. Goff

socat is a tool to connect (nearly) everything to (nearly) everything, and tee can duplicate streams.
In your usecase you could connect your serial port /dev/ttyS0 to a PTY /tmp/ttyV0, then point your application to the PTY, and have socat tee out Input and Output somewhere for you to observe.

Googling 'socat serial port pty tee debug' will point you to several examples, one being:

The files in.txt and out.txt will then contain the captured data.

This has been confirmed to work by commenters (@ogurets).

Alex StragiesAlex Stragies

I don't think the serial driver has any tracing functionality that would allow you to watch packets. You can use strace to observe all the reads and writes from your application:

GillesGilles

Linux Serial Port Communications

interceptty does that job:

or, with a nice output format and with configuring the backend device, and with line buffering:

and then connect with your programme to /dev/ttyDUMMY.

When I debug interaction of my application with a serial port, I use moserial.

Michael Mrozek♦

Have a look at ttyUSBSpy.It is on alpha stage, but it works.

Cristian Ciupitu

minicom is missing from the list of tools to monitor serial ports. Use it as for example to listen to arduino device:

minicom --device /dev/ttyACM0 --baud 9600

Thanks to Gilles's answer!

Php Serial Port Communication Linux

Sorry, I will explain..

• I use ls -l /proc/[0-9]*/fd/* grep ttyUSB0 instead of lsof ttyUSB0 because I seen them somtime slow.
• So strace will trace current program using ttyUSB0
• Syntax: tty${1:-USB0} will permit, used as a script, to run then with serial device name as argument: ttySniff USB0 or ttySniff S0 and so on.
• Perl script will unbackslash strings logged by strace.

Linux Serial Connection

Nota: I run them by using script -t so I could replay the whole and trace timing executions.

Linux Connect To Serial Port

Linux Test Serial Port Communication

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