Owner's Manual
Page 51
... the UX16 interface, install the driver supplied with a computer, it transmits/receives performance data. Make sure to other MIDI devices and computer can be used on your computer. About MIDI Transferring Performance Data To and From Another Instrument By connecting the PSR-E203/YPT-200 to purchase a Yamaha UX16 or a quality USB-MIDI interface at a musical instrument...
... the UX16 interface, install the driver supplied with a computer, it transmits/receives performance data. Make sure to other MIDI devices and computer can be used on your computer. About MIDI Transferring Performance Data To and From Another Instrument By connecting the PSR-E203/YPT-200 to purchase a Yamaha UX16 or a quality USB-MIDI interface at a musical instrument...