Small programm made for sending receipt printing commands to emar printo 57t receipt printer.
It also shows receipt data preview in a table.
Data must be provided in a .rct file containing a JSON text structure.
Example file content:
{
"data": [
"1#e",
"1$d",
"0$h",
"1;0;0;$lOrder 1<CR>1<CR>A/0.01/0.01/",
"1;1$b0.01/Credit Card<CR>",
"1;$ePark Cafe<CR>0/0.01",
"12$z",
"28;0$z"
],
"preview": {
"1": {
"name": "Order 1",
"amount": 1,
"price": "0.01",
"total": "0.01"
}
}
}The programm automatically converts "<CR>" to "\r" inside the commads.
It also calculates the chechsum for every command and wraps the commands into a structure defined in the printers protocol:
ESC P <data goes here> <checksum> ESC \
Where ESC is ASCII code 0x1b