Epson C31CE94061N Technical Reference Manual page 129

Item
Parity check
Parity selection
Stop bit
Connector Printer side
Functions of each connector pin
Pin no. Signal name
1 FG
2 TXD
3 RXD
4 RTS
6 DSR
7 SG
Select one of the following with DIP switch 1-5:
 Yes
Select one of the following with DIP switch 1-6:
 Even
1 or more bits
However, the stop bit for data transfer from the printer is fixed to 1 bit.
DSUB 25-pin (female) connector
Signal direction
— Frame ground
Output Transmission data
Input Reception data
Output Equivalent to DTR signal (pin 20)
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.
Changing DIP switch 2-7 lets this signal be used as a printer
reset signal.
When you use this signal as the printer's reset signal, the
printer is reset when the signal remains MARK for a pulse
width of 1 ms or more.
— Signal ground
Specifications
 No
 Odd
Function
Appendix
129