Epson T88III specifications Serial interface connection example, Reset Switching

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2.1.1.5 Serial interface connection example

Host side	Printer side
(DTE ex.8251)
TXD	RXD
DSR	DTR
CTS	RTS
RXD	TXD
DTR	DSR
FG	FG
SG	SG

NOTES: • Set the handshaking so that the transmit data can be received.

•Transmit data to the printer after turning on the power and initializing the printer.

2.1.1.6Notes on setting DIP switch 2-1 to ON

1)The printer mechanism stops but does not become busy when: an error has occurred, the cover is open, printing stops due to a paper-end, or paper is fed using the paper feed button.

2)When setting DIP switch 2-1 to ON to enable handshaking with the printer, be sure to check the printer status using the GS a command and the ASB function. In this setting, the default value of n for GS a is 2. The printer automatically transmits the printer status, depending on online/offline changes.

3)When using DLE EOT, DLE ENQ, and DLE DC4 be sure that the receive buffer does not become full.

•When using a host that cannot transmit data when the printer is busy:

If an error has occurred, DLE EOT, DLE ENQ, and DLE DC4 cannot be used when the printer is busy due to a receive buffer-full state.

•When using a host that can transmit data when the printer is busy:

When the receive buffer becomes full while transmitting bit-image data, DLE EOT, DLE ENQ or DLE DC4 used while sending the bit-image data is processed as bit-image data. The data transmitted when the receive buffer is full may be lost.

Example: Check the printer status using GS r after transmitting each line of data and use the 4 KB receive buffer. Transmit one line of data so that the receive buffer does not become full.

2.1.1.7 Notes on Resetting the Printer Using the Interface

The printer can be reset using interface pins 6 and 25 by changing the DIP switch setting (refer to Section 3.3.3, DIP switch 2).

	Table 2.1.3	Reset Switching
Signal Line	DIP Switch		Reset Condition
Pin 6 (DSR)	DSW 2-7: ON		MARK level input
Pin 25 (INIT)	DSW 2-8: ON		SPACE or TTL-HIGH level input

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TM-T88IIIseries

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