Epson STYLUS COLOR 3000 Service Manual page 24

Product Description
Table 1-21 shows the connector pin assignments and signals for the forward channel of the parallel interface.
Table 1-21. Connector Pin Assignments and Signals (Forward Channel)
Pin No. Signal Name
1 /STROBE
2-9 DATA 0-7
10 /ACKNLG
11
12
13
14
31
32
36
18
35
17 Chassis GND
16,33,19-30
15,34
Notes:
1. / at the beginning of a signal means active low.
2. The I/O column indicates the direction of the signal as viewed form the printer.
1-18
Return
GND Pin
19
20-27
28
BUSY 29
PE 28
SLCT 28
/AFXT 30
/INIT 30
/ERROR 29
/SLIN 30
Logic H -
+5V -
-
GND -
NC -
I/O Description
The strobe pulse. Read-in of data is
I
performed at the falling edge of this
pulse.
The data 0 to data 7 signals represent
data bits 0 to 7, respectively. Each signal
I
is at a HIGH level when data is logical 1
and a LOW level when data is logical 0.
This signal is a negative pulse indicating
O
that the printer can again accept data.
When this signal is at a HIGH level, the
O
printer is not ready to accept data.
When this signal is at a HIGH level, the
O
paper empty status is detected.
Always at a HIGH level when the printer
O
is powered on.
I Not used.
The falling edge of a negative pulse or a
LOW signal on this line causes the printer
I
to initialize. Minimum 50 us pulse is
necessary.
When the printer detects an error, this
O
signal goes LOW.
I Not used.
O Pulled up to +5V via 3.9 K-ohm resistor.
O Pulled up to +5V via 3.3 K-ohm resistor.
- Chassis ground.
- Signal ground.
- Not connected.
EPSON Stylus Color 3000 Service Manual