如何在ESC / POS中生成副本

Question

You want to print two copies of a voucher in ESC / POS language, but I can not find the function in the documentation to do it

just as there is a command to cut the paper

$ printer-> cut ();

just as there is a command to feed the paper

$ printer-> feed (3);

There is not one that, when I pass a certain parameter, prints a voucher n times?