Epson MX-80 User Manual page 94

.Appendix G
Appendix K
Pinout Signal Chart
Parallel Interface
PIN RETURN
PIN
SIGNAL NAME SOURCE
...
FUNCTION
Those signals listing a
RETURN
PIN
Those signals listing a
return pin require twisted 1 19 STROBE
Input Device A 0.5MS (min.) pulse used to clock data
pair lines with the return
from the input device to the printer logic.
to logic ground. 2 20 DATA 1
Input Device Input data levels from 1 st bit to 8 th bit.
A 36-pin female mating 3 21 DATA 2
H
A high represents a binary one, a low
connector is Amphenol 4 22 DATA 3
H
represents a binary zero.
type 57-30360.
5
6
7
8
9
23
24
25
26
27
DATA 4
DATA 5
DATA 6
DATA 7
DATA 8
H
K
H
a
a
10
28 ACKNLG
Printer A pulse low indicates that a character data
has been received and the printer is ready
to accept another character.
11 29 BUSY
Printer
High level signal indicates that the printer
can not receive data. Low level signal indi-
cates that the printer can receive data.
This signal becomes high in the follow-
ing conditions.
® During data entry.
(2) Printing or printhead's moving time
3) Off Line state
(J) Error state
12 30 PE
Printer
High level signal indicates that the printer
is out of paper
13
SLCT Printer
High level signal indicates that the printer
is selected
14
AUTO FEED XT Input Device Low level signal enables automatical line feed,
after printing one line.
15 NC
N/A
16 OV Logic ground
17
CHASSIS GND
Chassis ground
18 NC N/A
31
M T Input Device
A 50 M S pulse (min.) used to initialize the printer
32 eftftOR Printer
Low level signal indicates an error condition.
33
GND
34 NC
N/A
35
Printer
pulled up to + 5 VDC
36 SLCT IN Input Device Low level signal makes printer selected
condition.
104
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