A-4. Communication Protcol - Star SP200F SERIES User Manual

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.
RXD
DTR
Printing
Power on
when paper is out
RXD
DTR
When printing
PAPER OUT
signal
Power on
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
Data
Buffer full
OFF LINE
Paper end
– 91 –
Data Data
Buffer empty
ON LINE
Press the ONLINE button
after loading paper.