I’m trying to make a POS thermal printer work with linux. As far as I understand it, I can send data to print directly to the printer throgh a port – it’s an RS232 with USB adapter. It gets connected fine, detected as a pl2303 converter and shown to be /dev/ttyUSB0.
Main problem is – contrary to most information I was able to find online, cating the file and then echoing to it (tried many combinations of data and commands) has no results, including nothing being printed. The terminal with cat is just waiting and not showing anyhting – no gibberish, nothing. Echo returns no errors either.
Being totally incompetent with “low level” stuff like this I tried everything I was able to find in Google to no avail. Something that I was able to find that might be an explanation, was this thread: https://unix.stackexchange.com/questions/459466/pl2303-pl2303x-usb-serial-driver
I’m pretty sure my hardware also “commonly uses 3 pins”, as well as has DTR = 1 (and every other pin with the same value if that helps).
I am unable to try his solution though, as I don’t really understand it nor am I running any C code really – I’m trying to print from the commandline.
Any help is appreaciated – I’m totally lost.
