Adata SP300 Spezifikationen PDF herunterladen (Seite 25)

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Sends <ENQ>

Receives status byte.

Sends <STX>

Is the data buffer

empty?

Is an odd parity

check?

Acquires the exclusive OR of the content

of the text byte and the data to sent, then

it is used as the content of the test byte.

Transmits the data to

the printer.

Is this the last data in

a block?

Starts the

STX-ETX mode.

The test byte is set at (0)H.

Sends an <ENQ>

Receives status signal.

Receives a check byte.

Sends <ETX>

Sends <CAN>

Ends the

STX-ETX mode.

RET

Is there a data block in

the STX-ETX mode?

YES

NO

(Printing)

NO

YES

YES

NO

YES

NO

YES

NO

Horizontal

parity check

Check byte =

test byte?

Is the status an

error?

YES

(FF) H is set for the text

byte.

NO

Check byte:

Horizotal parity of the printer.

Test byte:

Horrizontal parity of the host

computer.

STX-ETX mode flow diagram for host computer

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 69 70

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