Epson Stylus PHOTO 1270 Service Manual page 23

EPSON Stylus PHOTO 870/1270
Pin No.
1 -STROBE
2-9 DATA0-7
10 -ACKNLG
11
12
13
14
15
16
17
18
19-30
31
32
33
34
35
36
NOTE: In/Out refers to the direction of signal flow seen from the printer side.
PRODUCT DESCRIPTIONS
Table 1-13. Connector Pin Assignment and Signals
Signal Return
In/Out
Name GND Pin
The strobe pulse. Read-in of data is performed at the falling edge of this
19 In
pulse.
The DATA0 through DATA7 signals represent data bits 0 to 7, respectively.
20-27 In
Each signal is at high level when data is logical 1 and low level when data is
logical 0.
This signal is a negative pulse indicating that the printer can accept data
28 Out
again.
BUSY 29 Out A high signal indicates that the printer cannot receive data.
PE 28 Out A high signal indicates paper-out error.
SLCT 28 Out Always at high level when the printer is powered on.
-AFXT 30 In Not used.
NC - - Not connected
GND - - Signal GND
Chassis
- - Chassis GND
GND
Logic H - Out Pulled up to +5V via 3.9 K ohm resistor.
GND - - Signal GND
The falling edge of a negative pulse or a low signal on this line causes the
-INIT 30 In
printer to initialize. Minimum 50us pulse is necessary.
-ERROR 29 Out A low signal indicates printer error condition.
GND - - Signal GND
NC - - Not connected
+5V - Out Pulled up to +5V via 3.3K ohm resistor.
-SLIN 30 In Not used.
Functional Description
Interface
Revision B
23