Epson LX-300 Service Manual page 19

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Pin Assignments for Parallel Interface
Description
The STROBE pulse is used to read the input
data. The pulse width must be more than 0.5 p.s.
Input data is latched after the falling edge of this
signal.
Parallel input data to the printer.
A HIGH level means data 1.
A LOW level means data O.
This pulse indicates data has been received and
the printer is ready to accept more data. The
pulse width is approximately 12 pa.
HIGH indicates the printer cannot accept more
data.
HIGH indicates rm~er-out. This signal is effective
only when the ERROR signal is LOW.
Always HIGH output. (Pulled up to +5V through
3.3 KQ resistor.)
If the signal is LOW when the printer is initialized
a line feed is automatically petformecf upon
receipt of the CR code (auto LF).
Not
Signal ground.
Chassis ground.
In the printer, chassis ground and signal ground
are short-circuited.
A HIGH level means that printer power is on.
Signal ground.
Input for printer initialization. Pulse width 50 ~
minimum, active LOW.
LOW indicates that some error has occurred in
the printer.
Signal ground.
Pulled up to +5V through 1 KQ resistor.
Ignored.
Rev. A