When using several types of printer for a special purpose, sometime we have to send hexadecimal character to control the printer and to by pass the printer driver.
The example is shown below

int li_job
li_job = PrintOpen()
// Print Mode
PrintText ( li_job, "~h1B~h21~001", 0, 0)
// Spacing
PrintText ( li_job, "~h1B~h33~001", 0, 0)
PrintClose ( li_job )