Table 1-8. 8-Bit Parallel Iif Connector Pin Assignment - Epson SQ-B50/2550 Technical Manual

REV.-A
Table 1-8. 8-Bit Parallel IIF Connector Pin Assignments
Pin No. Signal Return I/O Description
Strobe pulse to read the input data. Pulse width must be
1 STROBE 19 I more than 0.5 p,s. Input data is latched after falling edge of
this signal.
2 DATA 1 20 I Parallel input data to the printer.
3 DATA2
21 I "HIGH" level means data "1".
4 DATA3 22 I
"LOW" level means data "0".
5
DATA4 23 I
6
DATA5 24 I
7 DATA6 25 I
8
DATA7 26 I
9 DATA8
27
I
This pulse indicates data are received and the printer is
10 ACKNLG 28
0 ready to accept next data.
Pulse width is approx. 10 p,s. (See NOTE5)
11 BUSY
29 0
"HIGH" indicates printer can not accept data.
(See NOTE5)
12
PE 30 0
"HIGH" indicates paper-out.
This signal is effective only when ERROR signal is "LOW".
13
SLCT 0
Always "HIGH". (Pulled up to +5V through 3.3 K ohms
-
resistor.)
If this signal is "LOW" when the printer is initialized, a line
14 AUTOFEED-XT
-
I
feed is automatically performed by input of "CR" code. (See
NOTE6)
15
Not used.
16
GND
Ground for twisted-pair.
17 Chassis GND
-
-
Printer chassis ground.
18
Not used.
19 to 30
GND
Ground for twisted-pair.
31
INIT 16 I
Pulse (width: 50 p,s min., active "LOW") input for printer
initialization.
"LOW" indicates that some error has occurred in the printer.
32 ERROR 0
(Refer to section 1.4.3.4)
33
GND
- -
Ground for twisted-pair.
34 -
-
Not used.
35
0
Always "HIGH". (Pulled up to +5V through 3.3 K ohms
-
resistor.)
If the signal is "LOW" when printer is initialized, the
36
SLECT-IN
-
I
DC 1/DC3 control is disabled. (See NOTE6 and Table 1-9)
NOTE 1: The signals with a bar over the name are active-Iow.
NOTE 2: "Return" denotes a twisted pair return line, connected to signal ground. When interfacing
the printer to the host machine, use twisted pairs for each signal and be sure to connect the
return sides. Shield the twisted pairs, and connect the shield to the GND of the host machine
in order to reduce noise.
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