Data transmission rate (baud rate)
Baud rate | Switch 6 | Switch 7 |
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1200 | OFF | OFF |
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2400 | OFF | ON |
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4800 | ON | OFF |
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9600 | ON | ON |
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A-4. Communication Protcol
Signals are controlled using the DTR line as BUSY flag.
RXD |
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| Data |
| Data |
| Data |
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| Buffer full |
| Buffer empty |
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DTR |
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Printing
Power on
when paper is out
RXD
OFF LINE | ON LINE |
DTR
When printing 
Paper end | Press the ONLINE button |
| after loading paper. |
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
APPENDIX
– 90 –
