I have aquired a Citq H10, which is, in essence, an android tablet attached to a thermal printer. I pretty much made a paper weight out of the tablet, it doesn't start anymore, and I can't seem to do anything about it.
On the driver board of the printer, there is a MAX232 equivalent (UM3232EESE) so it would be evident, that it communicates over serial (rs232).
I have connected a DB9 connector, and I'm positive, i've done it right (the cursor on the terminal of COM1 pauses when turning on the printer).
There were a few test apps on an SD Card, and I reverse engineered some of it, I figured out, that it send info by copying bytes to the file of the port (I think). I tried copying the same bytes, but nothing happened.
So my question after all this text is: would I need a specific driver or do you see anything else wrong with my methods?
Tl,dr: can I use a thermal printer by copying bytes to it?