Appendix a-9 – Epson 2250 User Manual
Page 80
Technical Specifications
The table below provides the connector pin assignments and describes their
respective interface signals.
Signal Return
Signal
Direction
Description
Pin
Pin
1
19
STROBE IN
STROBE pulse to read data. Pulse width
must be more than 0.5 microseconds at
the receiving terminal.
2
20
DATA 1
IN
These signals represent information in
3
21
DATA 2
IN
the 1 st to 8th bits of parallel data,
4
22
DATA 3
IN
respectively. Each signal is at HIGH level
5
23
DATA 4
IN
when data is logical 1 and LOW when
6
24
DATA 5
IN
it is logical 0.
7
25
DATA 6
IN
8
26
DATA 7
IN
9
27
DATA 8
IN
1 O
28
ACKNLG
OUT
About a 1 O-microsecond pulse. LOW
indicates that data has been received and
that the printer is ready to accept more
data.
11
29
BUSY
OUT
A HIGH signal indicates that the printer
cannot receive data. The signal goes
HIGH in the following cases:
1) During data entry
2) During printing
3) During an error state
12
30 PE
OUT
A HIGH signal indicates that the printer is
in a paper-out state or in an error state.
13 -
SLCT
OUT
Pulled up to 5V through 1.0
resistance.
14 -
IN
When this signal is LOW, the paper is
automatically fed one line after printing.
(The signal level can be fixed to this
by setting Auto Line Feed on in the
default-setting mode.)
15 - -
-
Not used
16
-
GND -
Logic ground level
17 -
CHASSIS -
Printer’s chassis ground, which is
GND
isolated from the logic ground
Appendix A-9