2-6. Data Structure
2-6-1. DTR mode
This mode is accessed when the DIP switch
RXD |
| Data |
|
|
|
Buffer full
DTR
Printing
Data
Buffer empty
Data
Power ON
When paper is out
RXD
OFF LINE | ON LINE |
DTR
Printing
Paper out
PAPER OUT signal
Power ON
Press the ON LINE switch after loading paper.
If a 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 buffer is below 256 bytes. After the host computer detects that the DTR signal line is at “MARK”, transmission of the data text is sopped. In this instance, data can still be received up until the data buffer becomes completely full.
When the empty space in the data buffer is increased following printing (when the data in the data buffer is reduced to 256 bytes or less), the printer sets the DTR signal line to “SPACE”.
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