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2-6. Data Structure

2-6-1.DTR mode

This mode is accessed when the DIP switch 3-5 is ON.

Signals are controlled using the DTR line as BUSY flag.

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”.

RXD

DTR

Data Data Data

Buffer full Buffer empty

Printing

Power ON

RXD

DTR

OFF LINE ON LINE

When paper is out

Printing

PAPER OUT signal

Power ON

Paper out

Press the ON LINE switch after

loading paper.

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Adata SP300 Spezifikationen Seite 18