Epson TM-T20II Technical Reference Manual page 66

Change into the user setting mode
End the user setting mode session
Set values for the memory switch
Transmit the setting of the memory switch
Set the customized setting values
Transmit the customized setting values
Set conditions for serial interface communication
Transmit conditions for serial interface communication
Set conditions for USB interface communication
Transmit conditions for USB interface communication
Commands for macro function
Start/end macro definition
Execute macro
Commands for receipt enhancement
Cancel set values for top/bottom logo printing
Transmit set values for top/bottom logo printing
Set top logo printing
Set bottom logo printing
Make extended settings for top/bottom logo printing
Enable/disable top/bottom logo printing
Miscellaneous commands
Send real-time request to printer
Generate pulse in real-time
Execute power-off sequence
Control buzzer (optional external buzzer)
Clear buffer(s)
Sound buzzer (sound pattern specified) (optional external buzzer)
Select peripheral device
Initialize printer
Select page mode
66