Epson TM-U590 Series Manuale - Pagina 7
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You can try selecting the serial port in use (COM4 in the above example).
Press the 'Configure Port' button to open the properties screen.
Enter the same settings as were printed out in the adapter self-test.
We recommend that you run off the 'bidirectional printing' option on the Ports screen.
Installing the Printer Driver in Windows
After installing the drivers, the printer should be visible in the printers folder of the Windows Control Panel.