Epson LQ-570e Service Manual page 26

EPSON LQ-570e/LQ-580
o BUSY signal is active (HIGH level) under the conditions below:
n In the process of receiving data
n In the condition of being input buffer full
n In the condition of being -INT signal active (low level)
n During hardware initialization
n In the condition of being -ERROR or PE signal is active (low level, high level,
respectively)
n
In the self test mode
n In the adjustment mode
n In the default-setting mode
o -ERROR signal is active (low level) under the conditions below:
n In the condition of a paper-out error
n In the condition of a release lever error
o PE signal is active (high level) under the condition below:
n In the condition of a paper-out error
Table 1-22. Connector Pin Assignment and Signals
Return
Signal
Pin No. GND In/Out
Name
Pin
1 -STROBE 19
2 DATA1 20
3 DATA2 21
4 DATA3 22
5 DATA4 23
6 DATA5 24
7 DATA6 25
Product Description
Function Description
Strobe pulse. Input data is latched at falling
In
edge of the signal.
Parallel input data to the printer.
In
In
In
In
In
In
Table 1-22. Connector Pin Assignment and Signals
Signal
Pin No.
Name
8 DATA7
9 DATA8
10 -ACKNLG
11 BUSY
12 PE
13 SLCT
14 -AFXT
31 -INIT
32 -ERROR
36 -SLIN
18 Logic H
35 +5V
17 Chassis
bit0:LSB
16, 33,
bit1 GND
19-30
bit2
15, 34 NC
bit3
* In/Out shows the direction of signal flow from the printer's point of view.
bit4
bit5
Interface Specifications
Return
GND In/Out Function Description
Pin
26 In
27 In
This signal (negative pulse) indicates that the
28 Out printer has received data and is ready to accept
next one.
This signal's high level means that the print is
29 Out
not ready to accept data.
This signal's high level means that the printer is
28 Out
in a state of paper-out error.
Always at high level when the printer is
28 Out
powered on.
30 In Not used.
30 In This signal's negative pulse initializes printer.
This signal's low level means the printer is in a
29 Out
state of error.
30 In Not used.
This line is pulled up to +5V through
-- Out
3.9 kΩ resister.
This line is pulled up tp +5V through
-- Out
1.0 kΩ resister.
-- -- Chassis GND.
-- -- Signal GND.
-- -- Not connected.
Revision C
bit6
bit7:MSB
26