Table 1-8. Parallel Interface Pin Assignments - Epson C11C605001 - DFX 9000 B/W Dot-matrix Printer Service Manual

General Description

Table 1-8. Parallel Interface Pin Assignments

Signal Name
Pin No.
1 STROBE
DATA 1-8
2-9
10
BUSY
PE
12
SLCT
13
14 AUTO-FEED
15 NC
16
CHASSIS GND
17
18 NC
19-30
31
32 ERROR
33
34
35
36
1-12
STROBE is a strobe pufse used to read data from the host
computer. The pulse width
IN
Normally it is HIGH, and data is latched at the trailing edge of
this sicmal.
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 O.
The most significant bit (MSB) is DATA8. The signal state
IN
must be maintained for 0.5 p.aec. on either side of the
STROBE signal active edge.
acknowledge pufse
10 psec. This signal goes LOW
of 1 or
OUT reception is completed,
accept new data. l"iming with the BUSY signal is specified
through SelecType.
The BUSY signal informs the host computer of the printer
OUT
state. When the sianal is HIGH. the minter cannot acceot dat~
The PE
signal indicates paper ernptyfor the standard tray
OUT selected through SelecType or command, or for the optional
paper cassett~ Paper empty is indicated by HIGH.
OUT Use in reverse mode.
IN used.
used.
connected to the printer chassis. The printer chassis GND
and the signal GND are connected to each other.
Not connected.
Ground level for the twisted pair return signal.
IN
This level goes LOW when the printer is:
out of paper
OUT
in error state
Same as for tins19 to 30.
used.
Pulled UD
to +5V thmuah 1.0 Kohm resistance.
the reverse mode.
Use
must be more than
with an approximate width
when the data
which indicates that the printer can
I
0.5&c.
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Rev. A