EC-520 User’s Manual
a) Select pulse: Pulse is supplied from exterior/STROBE.
b) Signal exchange: /ACKNLG (answer) and BUSY.
c) Logic electric level: All the input data and interface control signal are compatible with TTL
electric level.
(2) Linker
Parallel interface is 57-30360
（
AMPHENOL
）
.The parallel interface connector is shown as
Figure 5-2.
Figure 5-2 pins NO. of the parallel interface connector
(3) Definition of pins (as shown in table A-2)
Table A-2 Pin function of parallel interface connector
Pin
return
Signal name
Direction
Description
1 19
/STROBE
Data
selected
IN
Width of selected pulse is 0.5
µ
sec.
2
20
DATA1
Date bit 1
IN / OUT
3
21
DATA2
Date bit 2
IN / OUT
4
22
DATA3
Date bit 3
IN / OUT
5
23
DATA4
Date bit 4
IN / OUT
6
24
DATA5
Date bit 5
IN / OUT
7
25
DATA6
Date bit 6
IN / OUT
8
26
DATA7
Date bit 7
IN / OUT
9
27
DATA8
Date bit 8
IN / OUT
Means 8 bits of parallel data signal. High level
means logical “1”, low level means logical “0”.
10 28
/ACKNLG
Answer
out OUT
Pulse width is about 12
µ
sec. Low level means that
data is received and the printer is ready for
receiving more data.
11
29
BUSY Printer
state OUT
High level out means that printer is busy and can’t
receive data. High level is out from this pin on the
following condition:
1. When data is being imported;
2. At the time of printing;
3. When the printer is offline;
4. When error happens.
12
30
PE
Paper out
OUT
High level means paper out.
13 SLCT
Printer is
selected
OUT
High level (5V) with the 3.3K
Ω
pull-up resistor.
14
/AUTOFEED Auto
feed
IN
At low level, the printer will change to the next line
to print automatically after one line printing is
finished.
15
NC
Empty pin
---
This pin is empty.
16 GND
Logical
ground ---
Logical
ground
17
CHASSIS
Structure
ground
---
It is structure ground of printer, and is separated
from logical ground.
18
NC
Empty pin
---
This pin is empty.
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