Epson TM-T81III Technical Reference Guide

72
Appendix
Functions of each connector pin
Pin
no.
Signal
name
Signal
direction
Function
1FG - Frame ground
2 RXD Input Reception data
3 TXD Output Transmission data
4 DTR Output 1) When DTR/DSR control is selected, this signal indicates whether the printer is BUSY.
 SPACE status
Indicates that the printer is ready to receive data.
 MARK status
Indicates that the printer is BUSY. Select the BUSY condition in the software
setting mode.
2) When XON/XOFF control is selected, this signal indicates that the printer is
properly connected and ready to receive data from the host.
 SPACE status
The signal indicates that the printer is properly connected and ready to receive
data from the host.
The signal is always SPACE, except in the following cases:
 During the period from when power is turned on to when the printer is ready to
receive data.
 While the self-test is in progress.
5 SG - Signal ground
6 DSR Input This signal indicates whether the host computer can receive data.
SPACE indicates that the host computer can receive data. MARK indicates that the
host computer cannot receive data.
When DTR/DSR control is selected, the printer transmits data after confirming this
signal. (except if transmitted using some ESC/POS commands).
When XON/XOFF control is selected, the printer does not check this signal.
7 RTS Output 1) When DTR/DSR control is selected, this signal indicates whether the printer is BUSY.
 SPACE status
Indicates that the printer is ready to receive data.
 MARK status
Indicates that the printer is BUSY. Select the BUSY condition in the software
setting mode.
2) When XON/XOFF control is selected, this signal indicates that the printer is
properly connected and ready to receive data from the host.
 SPACE status
The signal indicates that the printer is properly connected and ready to receive
data from the host.
The signal is always SPACE, except in the following cases:
 During the period from when power is turned on to when the printer is ready to
receive data.
 While the self-test is in progress.

Epson TM-T81III Specifications

General

Print Method	Thermal line printing
Resolution	203 x 203 dpi
Paper Width	79.5 ± 0.5 mm
Auto Cutter	Yes
Interface	USB, Serial
Dimensions	140 x 199 x 146 mm
Paper Thickness	0.06 to 0.08 mm