I have to update my question (May 4th). The male db25 connector misled me to the parallel port so I rephrased it.
I have an old computer system that sends live data (temperature from some external devices) to a parallel dot printer. This computer must not be changed. Instead of printing I would like to connect the printer cable in an (ubuntu os) pc serial port in order to receive those data and redirecting them in stdout.
Checking the db25 pins I discovered that it is used as RS232 serial cable. There are only three pin connected:
- pin 2 (TXD)
- pin 3 (RXD)
- pin 7 (GND)
So my intentions are firstly to connect those pins to a db9 serial connector in order to plug it in a pc serial port and secondly to open and read the input data using:
chmod o+rw /dev/ttyS0
cat -v < /dev/ttyS0
I believe that it is a simple solution and it is going to work.