Epson TM-L90 Developer's Manual page 88

Confidential
XON/XOFF
When XON/XOFF control is selected, the printer transmits XON or XOFF signals as follows.
Transmit timing differs depending on the memory switch 1-3 setting.
XON
XOFF
Code
The XON/XOFF codes are shown below.
J XON code: <11>H
J XOFF code: <13>H
Note:
When the printer goes from offline to online mode and the receive buffer is full, XON is not transferred.
When the printer goes from online to offline mode and the receive buffer is full, XOFF is not transferred.
When memory switch Msw 1-3 is off, XON is not transferred as long as the printer is offline even if a
receive buffer full state has been cleared.
Rev. A
Printer status
1) When the printer goes online after turning on the power (or
reset using interface)
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 the
DLE ENQ 1 or DLE ENQ 2 commands
5) When the receive buffer becomes full
6) When the printer switches from online to offline
TM-L90 Developer's Guide
Memory Switch 1-3
ON OFF
Transmit Transmit
Transmit Transmit
— Transmit
— Transmit
Transmit Transmit
— Transmit
Interface And Connectors A-3