Parallel Interface
Detailed descriptions of the signals follow.
Strobe* [nStrobe] (Pin 1)
A
Data 0 [1] to Data 7 [8] (Pins 2 to 9)
These eight signals form the data byte sent from the host computer to the printer. Data 7 [8] is the most significant bit.
Acknowledge* [nAck] (Pin 10)
This
Busy [Busy] (Pin 11)
This signal is high when the printer is busy and low when it is able to accept more data.
Paper Empty [PError] (Pin 12)
This signal goes high when the printer runs out of paper.
Online [Select] (Pin 13)
This signal is high when the printer is online and low when the printer is offline. It goes low when the upper unit is raised, or when the key is pressed to set the printer offline.
The Paper Empty and Online signals are not used unless enabled by the FRPO command (O2 parameter).
+5V DC (pin 18)
This line is connected to the printer’s +5V DC line (+5 V ±0.5 V, maximum 400 mA, fused.)
Reset [nInit] (Pin 31)
This signal is used in the standard Centronics interface to enable the computer to reset the printer.
Error* [nFault] (Pin 32)
When the
Auxiliary output 1 (Pin 33)
This signal line is not used.