Epson specifications TM-T81 Printer Status and Signals, 1.4 XON/XOFF transmit timing

Confidential

		Table 2.1.1
Pin	Signal	Signal
number	name	direction

25 INIT Input

TM-T81 Printer Status and Signals (Continued)

Function

2)When XON/XOFF control is selected:

The signal indicates whether the printer is correctly connected and is ready to receive data. SPACE indicates that the printer is ready to receive data. The signal is always SPACE except in the following cases:

•During the period from when the power is turned on to when the printer is ready to receive data

•During the self-test

Changing the DIP switch setting enables this signal to be used as a reset signal for the printer.

The printer is reset when the signal remains SPACE for 1 ms or more.

*1 • Definition of “receive buffer full”

•When the receive buffer capacity is specified to 4 KB (DIP SW1-2 is Off):

•If the DIP SW2-5 is off, when the remaining space in the receive buffer drops to 128 bytes, the printer status becomes “buffer full” and it remains “buffer full” until the space in the receive buffer increases to 256 bytes.

•If the DIP SW2-5 is on, when the remaining space in the receive buffer drops to 128 bytes, the printer status becomes “buffer full” and it remains “buffer full” until the space in the receive buffer increases to 138 bytes.

•When the receive buffer capacity is specified to 45 bytes (DIP SW1-2 is On):

•Regardless of the DIP SW2-5 setting, when the remaining space in the receive buffer drops to 16 bytes, the printer status becomes “buffer full” and it remains “buffer full” until the space in the receive buffer increases to 26 bytes.

•The printer ignores the data received when the remaining space in the receive buffer is 0 bytes.

2.1.1.4 XON/XOFF transmit timing

When XON/XOFF control is selected, the printer transmits XON or XOFF signals as follows. Transmit timing differs depending on the DIP SW2-1 setting.

Table 2.1.2 XON/XOFF Transmit Timing

	Printer status	DIP SW 2-1 status
		ON	OFF
XON	When the printer goes online after turning on the power (or	Transmit	Transmit
transmission	reset using interface)	Transmit	Transmit
	When the receive buffer is released from the buffer full state
	When the printer switches from offline to online	—	Transmit
	When the printer recovers from an error using the	—	Transmit
XOFF	DLE ENQ 1 or DLE ENQ 2 commands	Transmit	Transmit
	When the receive buffer becomes full
Transmission	When the printer switches from online to offline	—	Transmit

NOTES: 1. The XON code is <11>H and the XOFF code is <13>H.

2.In case , XON is not transmitted when the receive buffer is full.

3.In case , XOFF is not transmitted when the receive buffer is full.

TITLE

EPSON

TM-T81	SHEET	NO
	REVISION
Specification
		NEXT	SHEET
(STANDARD)	A
		14	13