Seeing exclamation marks means printer works in Star emulation mode instead of ESC/POS emulation mode. If your printer supports ESC/POS mode you can refer manuals to find how it switches to ESC/POS mode.
Seeing exclamation marks means printer works in Star emulation mode instead of ESC/POS emulation mode. If your printer supports ESC/POS mode you can refer manuals to find how it switches to ESC/POS mode.