Automatically Capturing, Saving and Publishing Serial RS232 Data to the Web

This article will describe establishing a system that may make the most of a light-weight command line (CLI) set up of Linux (Ubuntu on this instance) to seize RS232 (serial) info, seize it and add it to an ftp server.

This is beneficial for purposes together with knowledge assortment from sensors or different serial gadgets reminiscent of novice packet radio – and will make the most of the knowledge on a website online or different distant machine.

The course of will contain beginning the program ‘display screen’ and ‘minicom’ when the machine begins up. The ‘display screen’ output will likely be captured to textual content file. This textual content file will likely be despatched up to an ftp server utilizing ‘lftp’, scheduled through a ‘cron’ job.

This article won’t cowl putting in a command line Linux reminiscent of Ubuntu minimal – it’s assumed you will have a practical system. When the machine begins up, it ought to begin a indifferent ‘display screen’ session, beginning minicom (terminal program) inside – logging the display screen output to file.

To set up display screen and minicom, use: sudo apt-get set up display screen minicom

Verify your minicom settings

Run: sudo minicom -r, and set the default port and filter the init strings since the startup script runs as root. Ctrl-A o, set to ttyS0, 1200 (or the applicable different baud fee). Note that I additionally had to edit sudo nano /and many others/minicom/minirc.dfl to get it working correctly — despite the fact that I did sudo minicom -r — contents of my file:

# Machine-generated file – use “minicom -s” to change parameters.

pu baudrate 1200

pu bits 8

pu parity N

pu stopbits 1

pu mhangup

pr port /dev/ttyS0

Get display screen to auto-start at boot and run minicom:

In /and many others/init.d, create a startup script: sudo nano /and many others/init.d/startHAM



/usr/bin/display screen -d -m -L /usr/bin/minicom

modify the file so it can run at startup:

sudo chmod +x /and many others/init.d/startHAM

sudo update-rc.d startHAM defaults 80

I couldn’t get logging to work by passing “-L”, so edit the file: sudo nano /and many others/screenrc

add the strains:

go browsing

It is really helpful your reboot after modifying these information. After you reboot you’ll be able to see whether it is working by typing sudo display screen -r to resume the display screen session – you ought to be in minicom and ought to have the opportunity to see/sort to your TNC (or gadget).

If that works, you’ll be able to verify the log file – mine is saved to the root. nano /screenlog.0

You can tail it to watch in actual time something written to the log: tail -f /screenlog.0

You might want to sudo display screen -r, press return / mheard, and many others. (for a packet modem) to generate some textual content, then ctrl-a d (detach) and then nano /screenlog.0 and go to the finish – typically the management characters might disguise output, however it’s actually there.

Now you will have display screen and minicom beginning at startup and all the display screen output is being save to the screenlog.Zero file.

Uploading the screenlog.Zero file to your website online ftp server:

The program lftp can be utilized to synchronize information to an ftp server (your internet host). To set up lftp, sort: sudo apt-get set up lftp

Create an lftp script file “SyncHAM.txt” in your house listing: sudo nano SyncHAM.txt


open ftp: //

set ftp:ssl-allow no

mput -O /public_html/myhostbasepath /screenlog.0

-O is the base path on the internet host, after that’s the path to the file to be despatched (screenlog).

be aware the ssl-allow no is elective when you host doesn’t help ssl, the -R means reverse – ship the file UP to ftp.

To take a look at it, sort sudo lftp SyncHAM.txt

Setup Cron Job

edit the file: sudo nano /and many others/ by day/hamsync



lftp -f /house/cmate/SyncHAM.txt

echo “done with SyncHAM.txt”

make it executable:

sudo chmod +x hamsync

Be certain to reboot the machine. You ought to now have a practical system to seize the serial knowledge and add it day by day to the ftp server.

Source by Scott Szretter

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