Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 1 Product Description
17
1.3 Interface Specifications
A parallel interface is standard on all three printers.
1.3.1 Parallel Interface (Forward Channel)
Transmission mode
8-bit parallel, IEEE-1284 compatibilit
y
mode
Synchronization
STROBE pulse
Handshaking
BUSY and ACKLG
si
g
nals
Signal level
TTL-compatible level
Adaptable connector
57-30360
(
Amphenol
)
or e
q
uivalent
The BUSY si
g
nal is set hi
g
h before settin
g
either ERROR low or PE
hi
g
h, and remains hi
g
h until these si
g
nals return to their inactive state.
The BUSY si
g
nal is HIGH at these times:

Durin
g
data entr
y

When the input data buffer is full

When the INIT
si
g
nal is LOW, or durin
g
hardware initialization

When there is a printer error
(
See ERROR si
g
nal
)
The ERROR si
g
nal is LOW when the printer is in one of the followin
g
states.

Printer hardware error
(
fatal error
)

Paper-out error

Paper-
j
am error

Ink-out error
The PE si
g
nal is HIGH durin
g
a paper-out error.
Table 1-10
on the followin
g
pa
g
e shows the si
g
nal and connector pin
assi
g
nments for the parallel interface. With these si
g
nals, a twisted pair
line is used and the return side is connected to the GND si
g
nal.
NOTE: The forward channel is the mode used to send ordinary data,
such as when a print command is sent from the computer to
the printer.

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English