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Appendix A Hardware
Connector for printer connection
This is the connector for connecting to a printer.
Pin assignments
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)
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