Epson DLQ-3000+, Service Manual

Page: 39 / 262

DLQ-3000+
Rev. A
1-30
Table 1-25 shows the connector pin assignment and signals for forward channel of the
parallel interface.
Table 1-25. Connector Pin Assignments and Signals (Forward Channel)
Pin No. Signal Name
Return
GND Pin
I/O Description
1 /STROBE 19 I
The strobe pulse. Read-in of data is
performed at the falling edge of this
pulse.
2-9
DATA 1-8
20-27 I
The data 0 to data 7 signals
represent data bits 0 to 7,
respectively. Each signal is at a HIGH
level when data is logical 1 and a
LOW level when data is logical 0.
10
/ACKNLG
28 O
This signal is a negative pulse
indicating that the printer can again
accept data.
11 BUSY 29 O
When this signal is at a HIGH level,
the printer is not ready to accept data.
12
PE
28 O
When this signal is at a HIGH level,
the paper empty status is detected.
13 SLCT 28 O
Always at a HIGH level when the
printer is powered on.
14 /AFXT 30 I Not used.
31 /INIT 30 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.
32 /ERROR 29 O
When the printer detects an error, this
signal goes LOW.
36 /SLIN 30 I Not used.
18 Logic H O
Pulled up to +5V via 3.9 K-ohm
resistor.
35 +5V O Pulled up to +5V via 3.3 K-ohm
resistor.
17 Chassis GND Chassis ground.
GND
Signal ground.
15,34
NC
Not connected.
Note)
1. */* at the beginning of a signal means active low.
2. The I/O column indicates the direction of the signal as viewed form the printer.