set printer font index,n:0-4
echo -en "\x1d\x21\x0" > /tmp/DEVTERM_PRINTER_IN
echo -en "\x1d\x21\x1" > /tmp/DEVTERM_PRINTER_IN
echo -en "\x1d\x21\x2" > /tmp/DEVTERM_PRINTER_IN
echo -en "\x1d\x21\x3" > /tmp/DEVTERM_PRINTER_IN
echo -en "\x1d\x21\x4" > /tmp/DEVTERM_PRINTER_IN

ascii font size

0 = 8x16
1 = 5x7
2 = 6x12
3 = 7x14
4 = 8x16

unicode font size

0 = 12x12
1 = 14x14
2 = 16x16
3 = 18x18
4 = 20x20

81addc7f4b/Code/thermal_printer/devterm_thermal_printer.c (L381)

DC2 # n

n:0-F, set printer printing density

If you want to set the printing depth (printer heating time), you can use the following command to set it:

For the lightest:

echo -en "\x12\x23\x0" > /tmp/DEVTERM_PRINTER_IN

For the darkest:

echo -en "\x12\x23\xf" > /tmp/DEVTERM_PRINTER_IN

There are a total of 16 levels from 0 to 0xf. The default density is 6.

The heating time can be determined using the formula "n * (300 + n*46) microseconds."

DC2 T

print the test page
echo -en "\x12\x54" > /tmp/DEVTERM_PRINTER_IN

UNICODE

Edit /usr/local/etc/devterm-printer ,point to an existed ttf file,eg: TTF=/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc

then restart devterm-printer.service with

sudo systemctl restart devterm-printer

devterm-printer daemon will auto detect the ttf font file

switch to UNICODE MODE

echo -en "\x1b\x21\x1" > /tmp/DEVTERM_PRINTER_IN

switch back to default ASCII mode

echo -en "\x1b\x21\x0" > /tmp/DEVTERM_PRINTER_IN

then

echo "日月火水木金土 ΕΙΝΑΙ Ο ΘΕΟΣ ΓΕΩΜΕΤΡΗΣ" > /tmp/DEVTERM_PRINTER_IN

to print unicode characters

ESC V n rotation command,unicode mode only

echo -en "\x1b\x56\x0" >/tmp/DEVTERM_PRINTER_IN disable rotation

echo -en "\x1b\x56\x1" >/tmp/DEVTERM_PRINTER_IN 90 degree
echo -en "\x1b\x56\x2" >/tmp/DEVTERM_PRINTER_IN 180 degree
echo -en "\x1b\x56\x3" >/tmp/DEVTERM_PRINTER_IN 270 degree

How to run it from source

make
sudo systemctl stop devterm-printer
sudo cp -rf devterm_thermal_printer.elf /usr/local/bin
sudo systemctl start devterm-printer

README.md Unescape Escape

DevTerm Thermal printer

Console commands example

Eos/Pos commands example

ESC ! n