buzzer or beep command for SNBC BTP-R880NPIII

[persefoneit]

good morning

what's the command to send buzzer or beep command for SNBC BTP-R880NPIII?

i have tried

$printer -> getPrintConnector() -> write(PRINTER::ESC . chr(7));

and do only one beep. how is possibile to do multiple or long beep?

thank you