Table 1-12. 8-Bit Parallel L/F Connector - Epson LQ-2550 Technical Manual

Table 1-12. 8-bit Parallel l/F Connector Pin Assignments
Pin No.1
STROBE
2
3
4
5
6
7
8
9
10 ACKNLG
11 BUSY
PE
12
13 SLCT
14 AUTOFEED-XT
15 NC
16
17 Chassis GND
18 NC
to 30
19
31 INIT
.
32 ERROR
.
33
.
.
34 NC
.
35 + 5V
.
36 SLECT-IN
NOTES: 1. "Direction" of signal flow is as viewed from the printer.
2.
"Return" denotes "TWISTED PAIR RETURN" and is to be connected at signal ground level.
As to the wiring
never fail to connect the return side.
connected to the chassis of the host computer and the printer.
Return
I
19 Strobe pulse to read the input data. Pulse width must be
more than 0.5 KS. Input data is latched after falling edge of
this signal.
2 0 I Parallel input data to the printer.
21 I "HIGH" level means data "l".
I "LOW'" level means data "O".
22
I
23
24
I
25
I
26
27 I
28 0 This pulse indicates data are received and the printer is
ready to accept next data. Pulse width is approx. 11 IJS.
"HIGH" indicates printer can not accept data.
29 0
"HIGH" indicates paper-out.
3 0 0
This signal is effective only when ERROR signal is "LOW".
— o
Always "HIGH". (Pulled up to +5V through 3.3 K ohms
resistor.)
—
I
If this signal is "LOW" when the printer is initialized, a line
feed is automatically performed by input of "CR" code (Auto
LF).
—
— Not used.
—
— Ground for twisted-pair.
—
— Printer chassis ground.
—
— Not used.
—
— Ground for twisted-pair.
16 I Pulse (width: 50 WS min., active "LOW") input for printer
initialization.
— o
"LOW" indicates that some error has occurred in the printer.
—
— Ground for twisted-pair.
—
— Not used.
—
o Always "HIGH". (Pulled up to +5V through 3.3 K ohms
resistor.)
—
I If the signal is "LOW" when printer is initialized, the
DC l/DC3 control is disabled.
for the interface, be sure to use a twisted-pair cable for each signal and
Description
prevent noise, cables should be shielded and
To
1-15