Epson Stylus COLOR 1520 Service Manual page 24

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 0-17. 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.
16
Table 0-16. 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