6. Parallel Interface
6.1 Description on Input / Output Signals
(a) Input signals to printer
ODATA 1 …. 8 bit parallel input Data Signal, Logic “1” represent HIGH level. DATA 2
DATA 3 DATA 4 DATA 5 DATA 6 DATA 7 DATA 8
OSTB ……. This is a strobe for
(b) Output signals from printer
OACK ……. The printer transmits this signal to the host computer after it has received and processed input data and performed any function commands. This signal indicates that the printer is ready to receive additional data or function codes. This signal is normally HIGH.
This is activated when signal is LOW. The printer will not transmit this signal when DC3 code is received under SELECT state.
OBUSY …… This is an output signal from the printer. When the printer is BUSY state, the signal is HIGH.
OFAULT …. This is an output signal from the printer indicating printer FAULT state. The signal is LOW during a ALARM state. Conditions of Alarm
(1)If home position is not detected within the stipulated period.
(2)If clock pulse is not detected within the stipulated period.
OSLCT …… This is an output signal from the printer indicating whether the printer is in a SELECT or DESELECT state.
The signal is HIGH under the printer is
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