Epson LX-300 Service Manual page 20

LX-300+
BUSY signal is active (HIGH level) under the conditions below:
In the process of receiving data
In the condition of being input buffer full
In the condition of being -INT signal active (low level)
During hardware initialization
In the condition of being -ERROR or PE signal is active (low level, high
level, respectively)
In the self test mode
In the adjustment mode
In the default-setting mode
-ERROR signal is active (low level) under the conditions below:
In the condition of a paper-out error
In the condition of a release lever error
PE signal is active (high level) under the condition below:
In the condition of a paper-out error
Table 1-12. Connector Pin Assignment and Signals
Return
Pin Signal
GND In/Out
No. Name
Pin
1 -STROBE 19 In
2 DATA1 20 In
3 DATA2 21 In
4 DATA3 22 In
5 DATA4 23 In
6 DATA5 24 In
7 DATA6 25 In
Product Description
Functional Description
Strobe pulse. Input data is latched at
falling edge of the signal.
Parallel input data to the printer.
bit0:LSB
bit1
bit2
bit3
bit4
bit5
Interface Specifications
Table 1-12. Connector Pin Assignment and Signals
Return
Pin Signal
GND In/Out
No. Name
Pin
8 DATA7 26 In
9 DATA8 27 In
10 -ACKNLG 28 Out
11 BUSY 29 Out
12 PE 28 Out
13 SLCT 28 Out
14 -AFXT 30 In
31 -INIT 30 In
32 -ERROR 29 Out
36 -SLIN 30 In
18 Logic H -- Out
35 +5V -- Out
17 Chassis -- --
16, 33,
GND -- --
19-30
15, 34 NC -- --
NOTE: In/Out shows the direction of signal flow from the printer's
point of view.
Revision A
Functional Description
bit6
bit7:MSB
This signal (negative pulse) indicates
that the printer has received data and is
ready to accept next one.
This signal's high level means that the
print is not ready to accept data.
This signal's high level means that the
printer is in a state of paper-out error.
Always at high level when the printer is
powered on.
Not used.
This signal's negative pulse initializes
printer.
This signal's low level means the printer
is in a state of error.
Not used.
This line is pulled up to +5V through
3.9 kΩ resister.
This line is pulled up tp +5V through
1.0 kΩ resister.
Chassis GND.
Signal GND.
Not connected.
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