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TM
CHAP. 4
TECHN…
Sends ENQ
Receives status
byte
Is the
data buffer
empty ?
Sends STX signal
Is it
odd parity
check?
Set test byte FFH
YES
NO
Set test byte 00H
Acquires the exclusive OR of the
content of the test byte and the
data to send, 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 ?
YES
YES
YES
YES
NO
NO
NO
NO
Sends an ENQ
signal
Sends CAN
Sends ETX
Receives a check
byte
Receives status
signal
Is there a
data block in the STX-
ETX mode?
Check byte
= test byte?
Is the
status an
error?
NO
YES
Starts the STX-
ETX mode
Ends the STX -
ETX mode
RET
Horizontal
parity check