Reboot and reinstall.
If you want, I can:
Works seamlessly with most POS software via standard driver support. Sharp Printing: bc-809 printer driver
This usually indicates a baud rate mismatch (for Serial connections) or the wrong emulation mode. Ensure the driver is set to ESC/POS mode. Reboot and reinstall
For the BC-809 to communicate with your computer, you must install the official driver. Reboot and reinstall. If you want