EPSON Stylus COLOR 440, 640, and 740 Chapter 1 Product Description
18
Table 1-10. Signal and Connector Pin Assignments for the Parallel Interface
Pin No.
Signal
Name
Return
GND Pin
In/Out Functional Description
1STROBE
19 In
The strobe pulse. Data is read in at the
falling edge of this pulse.
2 to 9
DATA0 to
DATA7
20 to 27 In
The DATA0 through DATA7 signals
represent data bits 0 through 7. Each
signal is at a HIGH level when data is
logical 1, and at a LOW level when data
is logical 0.
10 ACKNLG
28 Out
This signal is a negative pulse indicating
that the printer can again accept data.
11 BUSY 29 Out
A HIGH signal indicates that the printer
cannot receive data.
12 PE 28 Out
A HIGH signal indicates a paper-out
error.
13 SLCT 28 Out
Always HIGH when the printer is
powered on.
14 AFXT
30 In Not used.
31 INIT 30 In
The falling edge of a negative pulse or a
LOW signal on this line causes the
printer to initialize. Minimum 50
µ
s pulse
is necessary.
32 ERROR
29 Out
A LOW signal indicates a printer error
condition.
36 SLIN 30 In Not used.
18 Logic-H — Out Pulled up to +5 V via 3.9K ohm resistor.
35 +5V — Out Pulled up to +5 V via 3.3K ohm resistor.
17
Chassis
GND
— — Chassis ground.
16,33,
19 to 30
GND — — Signal ground.
15,34 NC — — Not connected.
Notes: In and Out refer to the direction of signal flow from the printer’s point of view.
An overscore above a signal name means that the signal is active LOW.
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