I set up a similar Epson receipt printer 2 years ago under GNU/Linux.
In that setup, the printer had no driver. The POS software only had a
setting to indicate which COM port the printer was on.
When I was trying to work out whether the printer was functioning, I used a
command similar to this:
echo "test test test" > /dev/ttyS1
and the receipt printer printed:
test test test
It seemed that it just took raw ASCII input and printed anything that came
down the cable.
This setup did not install the printer as a CUPS printer and there was no
driver installed.
You may be able to hack a CUPS dummy driver that pipes the ASCII input
straight to the printer ( perhaps with a little help from CUPS forums and IRC
)
