Seiko Instruments DPU-30 Bedienungsanleitung PDF herunterladen (Seite 26)

4-4

Data timing for hardware control

RTS

RxD

ﾌﾟﾘﾝﾄ

紙無し

電源ON

ﾊﾞｯﾌｧ

4046ﾊﾞｲﾄ以上 3995ﾊﾞｲﾄ以下

ﾊﾞｯﾌｧ

ON-LINE

OFF-LINE

2. Xon/Xoff control

The data transmission from a host computer is controlled through the exchange of Xon(11

)

command and Xoff(13

) command between the printer and the host computer.

When the data stored in the input buffer of the printer exceeds 4,046 bytes, the printer sends the

Xoff command to the host computer.

Upon the reception of the Xoff command, the host computer stops to send the data.

If the data stored in the input buffer of the printer falls below 3,995 bytes, the printer sends the

Xon command to the host computer.

Upon the reception of the Xon command, the host computer resumes sending the rest of the

data.

∗ When the printer fails (for example, paper-out), the printer sends the Xoff command to the

host computer.

And then, after the printer gets back to normal, the printer sends the Xon command to the

host computer.

Data timing for Xon/Xoff control

TxD

RxD

ﾌﾟﾘﾝﾄ

紙無し

Xon

Xoff

Xon

電源ON

ON-LINE

OFF-LINE

4046ﾊﾞｲﾄ以上 3995ﾊﾞｲﾄ以下

ﾊﾞｯﾌｧﾊﾞｯﾌｧ

RTS

Xoff

Buffer

4,046 bytes

or more

RTS

RxD

Paper out

ON-LINE

OFF-LINE

Power ON

Buffer

3,995 bytes or less

RTS

RxD

Paper out

ON-LINE

OFF-LINE

Power ON

Xon

Xoff

Xoff Xon Xon

Buffer

4,046 bytes

or more

Buffer

3,995 bytes or less

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