Appendix A Hardware Connector for printer connection This is the connector for connecting to a printer. Pin assignments 67 Pin Num- ber Signal Name Signal Direction Signal Function 2 RXD Input Data received from the printer (Printer -> host) 3 TXD Output Data sent to the printer (Display -> printer) 4 DTR 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 5 GND - Signal GND 6 DSR 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 9 RESET Output Reset signal for the printer (Host -> printer)