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APPENDIX
Data transmission rate (baud rate)
Baud rate Switch 6 Switch 7
1200 OFF OFF
2400 OFF ON
4800 ON OFF
9600 ON ON
A-4. Communication Protcol
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.