Epson EPL-N1200 Service Manual - Page 25

Table 1-8. Parallel Interfaces Pin Assignment

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EPL-N1200 Service Manual General Description Table 1-8. Parallel Interfaces Pin Assignment Parallel-B Pin No. Signal Name I/O 1 STROBE I 2-9 DATA 1-8 I 10 ACKNLG O 11 BUSY O 12 PE O 13 SLCT O 14 AUTO-FEED I 15,18, 34 NC - 16 GND - 17 CHASSIS GND - 19-30 GND - 31 INIT I 32 ERROR O 33 GND - 35 +5 - 36 SLCT IN - -- - -- - Parallel-C Pin No. Signal Name I/O Description 15 STROBE STROBE is a strobe pulse used to read data from I the host computer. The pulse width must be more than 0.5 µsec. Normally it is HIGH, and data is latched at the trailing edge of this signal. 6-13 DATA 1-8 DATA 1 to 8 are parallel data bits. When the signal is HIGH, the data bit is 1, and when it is LOW, the I/O data bit is 0. The most significant bit (MSB) is DATA8. The signal state must be maintained for 0.5 µsec. on either side of the STROBE signal active edge. 3 ACKNLG ACKNLG is an acknowledge pulse with an approximate width of 1 or 10 µsec. This signal O goes LOW when the data reception is completed, which indicates that the printer can accept new data. Timing with the BUSY signal is specified through SelecType. 1 BUSY The BUSY signal informs the host computer of the O printer state. When the signal is HIGH, the printer cannot accept data. 5 PE The PE signal indicates paper empty for the O standard tray selected through SelecType or command, or for the optional paper cassette. Paper empty is indicated by HIGH. 2 SLCT O Use at reverse mode. 17 AUTO-FEED I Not used. - - - Not used. - - - - 19-35 GND 14 INIT 4 ERROR - - - - 16 SLCT IN 18 Host Logic High 36 Peripheral Logic High - Logic ground level. Connected to the printer chassis. The printer - chassis GND and the signal GND are connected to each other. - Ground level for the twisted pair return signal. I TLOheWS. TROBE signal is ignored when this signal is This level goes LOW when the printer is: out of paper O paper jam in error state off line - Same as for pins 19 to 30. - Pulled up to +5V through 1.0 Kohm resistance. I Use the reverse mode. I Hosyt logic high signal O Peripheral logic high signal Rev. A 1-13

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Table 1-8. Parallel Interfaces Pin Assignment
Parallel-B
Parallel-C
Description
Pin
No.
Signal Name
I/O
Pin
No.
Signal Name
I/O
1
STROBE
I
15
STROBE
I
STROBE is a strobe pulse used to read data from
the host computer. The pulse width must be more
than 0.5
μ
sec. Normally it is HIGH, and data is
latched at the trailing edge of this signal.
2-9
DATA 1-8
I
6-13
DATA 1-8
I/O
DATA 1 to 8 are parallel data bits. When the signal
is HIGH, the data bit is 1, and when it is LOW, the
data bit is 0.
The most significant bit (MSB) is DATA8. The
signal state must be maintained for 0.5
μ
sec. on
either side of the
STROBE signal active edge.
10
ACKNLG
O
3
ACKNLG
O
ACKNLG is an acknowledge pulse with an
approximate width of 1 or 10
μ
sec. This signal
goes LOW when the data reception is completed,
which indicates that the printer can accept new
data. Timing with the BUSY signal is specified
through SelecType.
11
BUSY
O
1
BUSY
O
The BUSY signal informs the host computer of the
printer state. When the signal is HIGH, the printer
cannot accept data.
12
PE
O
5
PE
O
The PE signal indicates paper empty for the
standard tray selected through SelecType or
command, or for the optional paper cassette.
Paper empty is indicated by HIGH.
13
SLCT
O
2
SLCT
O
Use at reverse mode.
14
AUTO-FEED
I
17
AUTO-FEED
I
Not used.
15,18,
34
NC
-
-
-
-
Not used.
16
GND
-
-
-
-
Logic ground level.
17
CHASSIS
GND
-
-
-
-
Connected to the printer chassis. The printer
chassis GND and the signal GND are connected
to each other.
19-30
GND
-
19-35
GND
-
Ground level for the twisted pair return signal.
31
INIT
I
14
INIT
I
The STROBE signal is ignored when this signal is
LOW.
32
ERROR
O
4
ERROR
O
This level goes LOW when the printer is:
out of paper
paper jam
in error state
off line
33
GND
-
-
-
-
Same as for pins 19 to 30.
35
+5
-
-
-
-
Pulled up to +5V through 1.0 Kohm resistance.
36
SLCT IN
-
16
SLCT IN
I
Use the reverse mode.
-
-
-
18
Host Logic
High
I
Hosyt logic high signal
-
-
-
36
Peripheral
Logic High
O
Peripheral logic high signal
EPL-N1200 Service Manual
General Description
Rev. A
1-13