140 Signal Printer status DIP switch 2-1 1 (ON) 0 (OFF) XON 1) When the printer goes online after turning on the power (or reset using the interface) Transmit Transmit 2) When the receive buffer is released from the buffer full state Transmit Transmit 3) When the printer switches from offline to online — Transmit 4) When the printer recovers from an error using some ESC/POS commands — Transmit XOFF 5) When the receive buffer becomes full Transmit Transmit 6) When the printer switches from online to offline — Transmit