Epson TM-T20II Technical Reference Guide - Page 91

Functions of each connector pin, Pin no., Signal name, Signal direction, Function

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Appendix Functions of each connector pin Pin no. Signal name Signal direction Function 1 FG - Frame ground 2 TXD Output Transmission data 3 RXD Input Reception data 4 RTS Output Equivalent to DTR signal 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. The printer is reset when the signal remains MARK for a pulse width of 1 ms or more. 7 SG - Signal ground 20 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. Set BUSY conditions with the memory switch. 2) When XON/XOFF control is selected, 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.  During the self-test. 25 INT Input The printer is reset if the signal remains at SPACE for a pulse width of 1 ms or more. 91

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Appendix
91
Functions of each connector pin
Pin no.
Signal name
Signal direction
Function
1
FG
—
Frame ground
2
TXD
Output
Transmission data
3
RXD
Input
Reception data
4
RTS
Output
Equivalent to DTR signal
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.
The printer is reset when the signal remains MARK for
a pulse width of 1 ms or more.
7
SG
—
Signal ground
20
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. Set BUSY conditions
with the memory switch.
2) When XON/XOFF control is selected, 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.
During the self-test.
25
INT
Input
The printer is reset if the signal remains at SPACE for a
pulse width of 1 ms or more.