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C-5
FS-1010
Signal Meaning
A negative-going Strobe* pulse causes the printer to read and latch
the data on the Data 0 [1] to Data 7 [8] signal lines.
These eight signals form the data byte sent from the host computer to
the printer. Data 7 [8] is the most significant bit and Data 0 [1] is the
least significant bit.
This signal is returned to the host computer. This negative-going pulse
acknowledges the previous character received by the printer.
Acknowledge* pulses are sent only when Busy is low.
This signal is returned to the host computer. This signal is high when
the printer is busy and low when it is able to accept more data. Every
high-to-low transition is followed by an Acknowledge* pulse.
This signal is returned to the host computer. This signal goes high
when the printer runs out of paper.
This signal is returned to the host computer. This signal is high when
the printer is on-line and low when the printer is off-line. It goes low
when the upper unit is raised, or when the Go key is pressed to set the
printer off-line.
Note: The Paper Empty and On-Line signals are not used unless
enabled by the FRPO command (O2 parameter).
This signal is used in the Epson version of the Centronics interface to
receive a carriage return. In high-speed mode, it is used as an interrupt.
This line is connected to the printer’s +5 V DC line (+5 V ±0.5 V, 400
mA maximum, fused).
This signal is used in the standard Centronics interface to enable the
computer to reset the printer. It is ignored by the printer.
When the high-speed parallel line control is on (FRPO O2 = 2), this
line returns error status to the host computer.
This signal line is not used.
This signal is high when the printer’s power is on.
This signal is used in some versions of the Centronics interface to
enable the computer to force the printer on-line. In high-speed mode,
it is used as an interrupt.
Strobe* [nStrobe] (Pin 1)
Data 0 [1] to Data 7 [8]
(Pins 2 to 9)
Acknowledge* [nAck]
(Pin 10)
Busy [Busy] (Pin 11)
Paper Empty [PError]
(Pin 12)
On-Line [Select] (Pin 13)
Auto-Feed [nAutoFd]
(Pin 14)
+5 V DC (pin 18)
Prime [nInit] (Pin 31)
Error* [nFault] (Pin 32)
Auxiliary output 1 (Pin 33)
Power Ready (Pin 35)
Select In [NSelectIn]
Parallel interface signals
The following table provides details for the signals used on the printer’s parallel interface. Note
descriptions in [ ] are for high-speed mode of the parallel interface.