Epson TM-T20 Technical Reference Manual page 84

XON/XOFF
When XON/XOFF control is selected, the printer transmits the XON or XOFF signals as follows.
The transmission timing of XON/XOFF differs, depending on the setting of memory switch 1-3.
Signal
XON 1) When the printer goes online after turning on the power
2) When the receive buffer is released from the buffer full state
3) When the printer switches from offline to online
4) When the printer recovers from an error using some ESC/POS
commands
XOFF 5) When the receive buffer becomes full
6) When the printer switches from online to offline
Code
The hexadecimal numbers corresponding to the XON/XOFF codes are shown below.
• XON code: 11H
• XOFF code: 13H
• When the printer goes from offline to online and the receive buffer is full, XON is not
• When the printer goes from online to offline and the receive buffer is full, XOFF is not
84
Printer status
transmitted.
transmitted.
Memory switch 1-3
1 (ON) 0 (OFF)
Transmit Transmit
Transmit Transmit
— Transmit
— Transmit
Transmit Transmit
— Transmit