Epson DM-D500 Technical Reference Manual page 67

Connector for printer connection
This is the connector for connecting to a printer.
Pin assignments
Pin Num- Signal
ber Name
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
9 RESET
Signal
Direction
Input Data received from the printer (Printer -> host)
Output Data sent to the printer (Display -> printer)
Output Indicates whether or not the host is ready to receive data.
[SPACE] The host is ready to receive data
[MARK] The host is not ready to receive data
- Signal GND
Input Indicates whether the display is ready to receive data from the printer
[SPACE] The printer is ready to receive data
Send once data is ready
[MARK] The printer is not ready to receive data
Do not send even when data is ready
Output Reset signal for the printer (Host -> printer)
Appendix A Hardware
Signal Function
67