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Epson Stylus COLOR 1520 Service Manual Page 24

Color ink jet printer.
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EPSON Stylus COLOR 1520
Table 1-16 shows the connector pin assignment and signals for forward channel of the parallel interface.
Note) * : Rises and falls in time of every output signals.
Table 1-17. Connector Pin Assignments and Signals (Forward Channel)
Pin No.
Signal Name
1
/STROBE
2-9
DATA 0-9
10
/ACKNLG
11
BUSY
12
PE
13
SLCT
14
/AFXT
31
/INIT
32
/ERROR
36
/SLIN
18
Logic H
35
+5V
17
Chassis GND
16,33,19-30
GND
15,34
NC
Note) 1. */* at the beginning of a signal means active low.
2. The I/O column indicates the diction of the signal as viewed form the printer.
1-16
Table 1-16. Data Transmission Timing
Parameter
tsetup
thold
tstb
tready
tbusy
tt-out*
tt-in**
treply
tack
tnbusy
tnext
**: Rises and falls in time of every input signal.
Return
GND Pin
19
20-27
28
29
28
28
30
30
29
30
-
-
-
-
-
Minimum
Maximum
500 ns
500 ns
500 ns
0
-
-
-
-
500 ns
0
0
I/O
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
I
data bits 0 to 7, respectively. Each signal
is at high level when data is logical 1 and
low level when data is logical 0.
O
This signal is a negative pulse indicating
that the printer can again accept data.
O
When this signal is at high level, the
printer is not ready to accept data.
O
When this sign is at high level, the paper
empty status is detected.
O
Always at high level when the printer is
powered on.
I
Not used.
I
The falling edge of a negative pulse or a
low signal on this line causes the printer
to initialize. Minimum 50 us pulse is
necessary.
O
When the printer detects an error, this
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.
-
-
-
-
500 ns
120 ns
200 ns
-
10 us
-
-
Description
Rev. A

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