EC-PM-530D User's Manual
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(3) Definition of pins (as shown in Table A-2)
Table A-2 Pin definition of parallel interface connector
Pin Return
Signal
name
Direction
Description
1 19 /STROBE
Data
selected
IN
Width of selected pulse is 0.5µ sec.
2
20
DATA1
Data bit 1
IN / OUT
3
21
DATA2
Data bit 2
IN / OUT
4
22
DATA3
Data bit 3
IN / OUT
5
23
DATA4
Data bit 4
IN / OUT
6
24
DATA5
Data bit 5
IN / OUT
7
25
DATA6
Data bit 6
IN / OUT
8
26
DATA7
Data bit 7
IN / OUT
9
27
DATA8
Data bit 8
IN / OUT
Represent 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 12µ sec. Low level
means that data is received and the printer
is ready to receive more data.
11 29 BUSY Printer
state
OUT
Outputting high level means that printer is
too busy to receive data. This pin outputs
high level under the following conditions:
1. When data is being imported;
2. When the printer is printing;
3. When the printer is offline;
4. When error occurs.
12
30
PE
Paper out
OUT
High level means paper out.
13
SLCT
Printer is
selected
OUT
Pull up to 5V by the 3.3K
Ω
resistor.
14
/AUTOFEED Auto
feed
IN
At low level, the printer will change to the
next line automatically after printing one line.
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 it is
separated from logical ground.
18
NC
Empty pin
---
This pin is empty.
19 - 30
GND
Ground
---
Loop ground that is twisted with signal wire.
31 16 /INIT
Initialization
of printer
IN
Low level means the printer is initialized
32
/ERROR
Error occurs
in printer.
OUT
When the printer is in state of paper out,
offline mode or error, this signal level
becomes low.
33
GND
Ground
---
Same with 19~30 pins.
34
NC
Empty pin
---
This pin is empty.
35
+5V
+5V supply
OUT
Pull up to 5V by the 3.3K
Ω
resistor.
36
/SLCTIN
Printer is
selected and
answered.
IN
Only when this signal level is low, can the
data be put into the printer.
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