|parallel port explanation|
Here is the table explaining about pins at connector parallel port DB 25
To make it clearer, each signals of parallel port can be converted as follows:
Strobe signal is a function of input signal on printer. This channel is activated by the computer if it will continue data to printer.
Ø Data 0-7:
This data signal is an input signal on printer. It is synchronized by strobe charge.
Ø Acknowledge (Ack):
Ack signal is an output signal from printer. While the printer has processed data received, it gives handshake signal in max 30 microseconds.
Busy signal is an output signal from printer. While the printer accepts the data or prints the data, the signal is activated. Besides, while there are some disturbances or off line status, the signal is also activated.
Ø Paper End/PE:
Paper End signal is an output signal from printer. This signal will continuously be active until the new paper is activated again.
Select signal is an output signal from printer. By this signal, the printer tells that it has been chosen and activated.
Ø Auto Feed:
When this signal is activated, the printer at the last of each line will move to the next lines automatically.
This output is active if there are any disturbances or the printer is not connected (off)
The printer turns back into the early condition by this channel
Ø Input Select:Printer selection as a tool of DTE (Data Terminal Equipment) occurs on this signal channel.