Epson DFX 8000, Service Manual

Page: 33 / 292

General
Description
Table 16. Pin Assignments for the Parallel Interface
Slgnal Return
Pln No. Pin No. Slgnal
1 19 -STROBE
I STROBE pulse to read in data. Pulse width must
be more than 0.5
at the receiving terminal.
2 20 DATA 1
I These signals represent information of the first to
3
21
DATA 2
I eighth bits of parallel data, Each
4 22 DATA 3 I signal is at HIGH level when data is logical 1 and
5 23 DATA 4 I LOW when data is logical 0.
6 24 DATA 5
I
7 25 DATA 6
I
8 26 DATA 7
I
9
27
DATA 8
I
10 28 -ACKNLG 0 Approximately a 12 pulse. LOW indicates that
data has been received and that the printer ready
to accept more data.
11 29 BUSY
0 A HIGH signal indicates that the printer cannot
receive data. The signal becomes HIGH in the
following cases:
l
During data entry
l
During printing
l
When off line
l
During a printer error state
12
30
PE 0 A HIGH signal indicates that the printer is out of
13
14
SLCT
-AUTO
-FEED XT
Pulled up to V through 3.3 K ohm resistor.
I When this signal is LOW, the paper is automatically
fed one line after printing. (The signal level can be
fixed to LOW by turning on DIP
15
16
17
NC Not used.
GND Logic GND.
CHASSIS Printer chassis GND. In the printer, the chassis
GND GND and the logic GND are isolated from each
other.
18 NC
GND
Not connected.
Twisted-pair return signal GND level.
1-22
DFX-8000