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Please answer / clarify each question so that it will be easier to help:<br />
<br />
1.) you have a serial printer connected to a PC?<br />
2.) What is your operating system?<br />
3.) You have an application, that can print to your printer?<br />
4.) printing is successful with that application?<br />
5.) you want to print from that application and monitor what is going on the serial port, while the printer is connected and printing?
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Please answer / clarify each question so that it will be easier to help:

1.) you have a serial printer connected to a PC?
2.) What is your operating system?
3.) You have an application, that can print to your printer?
4.) printing is successful with that application?
5.) you want to print from that application and monitor what is going on the serial port, while the printer is connected and printing?

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1) Yes, the serial printer is connected to a pc<br />
2) The pc connected to the printer is linux, the other pc I'd want to use will be probably a Raspberry Pi with Linux too<br />
3 &amp;&nbsp;4) The pc connected to the printer can print without problems<br />
5) No: I simply want to connect the Raspberry Pi instead of the printer and get the data instead of the printer
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1) Yes, the serial printer is connected to a pc
2) The pc connected to the printer is linux, the other pc I'd want to use will be probably a Raspberry Pi with Linux too
3 & 4) The pc connected to the printer can print without problems
5) No: I simply want to connect the Raspberry Pi instead of the printer and get the data instead of the printer

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It looks clear and straightforward!<br />
<br />
Thanks
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It looks clear and straightforward!

Thanks

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<div class="content wysiwyg-content">
Hello everyone!<br />
<br />
I would like to intercept data going to a serial printer using Python and read it...<br />
<br />
If this is possible which kind of tools / resources you suggest me to use / learn?
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Hello everyone!

I would like to intercept data going to a serial printer using Python and read it...

If this is possible which kind of tools / resources you suggest me to use / learn?

Read data from serial port using Python

Python is a widely used general-purpose, high-level programming language. Its design philosophy emphasizes code readability, and its syntax allows programmers to express concepts in fewer lines of code than would be possible in other languages. Python supports multiple programming paradigms, including object-oriented, imperative and functional programming or procedural styles. It features a dynamic type system and automatic memory management and has a large and comprehensive set of standard libraries, including NumPy, SciPy, Django, PyQuery, and PyLibrary.

Python

A printer is a peripheral which makes a persistent human readable representation of graphics or text on paper or similar physical media. Traditional printers are being used more for special purposes, like printing photographs or artwork, and are no longer a must-have peripheral; 3D printing has become an area of intense interest, allowing the creation of physical objects. An image scanner is a device that optically scans images, printed text, handwriting, or an object, and converts it to a digital image. Hand-held scanners, where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics, gaming and other applications.