Star Micronics SP200F SERIES - Manual (Page 94)

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APPENDIX
A-4. Communication Protcol
A-4-1. DTR mode
This is normally the mode for the RS-232C interface. This mode is enabled for
the RS-422A interface when the DIP switch 2-6 is set to OFF.
Signals are controlled using the DTR line as BUSY flag.
If printer errors do not occur after the power is turned on, the DTR signal line
changes to “SPACE”.
When the host computer confirms that the DTR signal line is set to “SPACE”, the
host computer sends the data text via the RXD signal line to the printer. Also, the
printer will set the DTR signal line to “MARK” when the empty space in the data
RXD
DTR
Printing
Data Data Data
Buffer full Buffer empty
Power on
when paper is out
RXD
DTR
OFF LINE ON LINE
When printing
PAPER OUT
signal
Power on
Paper end Press the ONLINE button
after loading paper.