Epson LQ-570e, Service Manual

Page: 25 / 129

EPSON
LQ-570e/LQ-580
Revision
C
Product
Description
Interface
Specifications
25
1.4
Interface Specifications
EPSON
LQ-570e/LQ-580 provides bi-directional 8 bit parallel interface and Type-B
optional
interface slot as standard.
1.4.1
Parallel Interface (Forward Channel)
o
Transmission
mode:
8
bit parallel
IEEE-1284
compatibility mode
o
Adaptable
connector:
57-30360
(Amphenol) or equivalent
o
Synchronization: -STROBE
pulse
o
Handshaking: BUSY
and -ACKLG signals
o
Signal
level:
TTL
compatible
(IEEE-1284
level 1 device)
*
Logic-H signal is 2.0V or lower when the printer is off and the signal is 3.0V or higher
when
the printer is on. The receiver has impedance which is equivalent to 7.5 k Ω
.
Figure
1-7. Data Transmitting Timing
*
Rise and fall time of output signals
**
Rise and fall time of input signals.
Table
1-20. Parameter
Parameter Minimum Maximum Condition
V
OH
* -- 5.5V
V
OL
* -0.5V --
I
OH
* -- 0.32mA V
OH
=2.4V
I
OL
* -- 12mA V
OL
=2.4V
C
O
-- 50pF
V
IH
-- 2.0V
V
IL
0.8V --
I
IH
-- 0.32mA V
IH
=2.0V
I
IL
-- 12mA V
IL
=0.8V
C
I
-- 50pF
Table
1-21. Maximum & Minimum Timings for Data Transmission
Parameter Minimum Maximum
t
setup
500
nsec
--
t
hold
500
nsec
--
t
stb
500
nsec
--
t
ready
0 --
t
busy
-- 500
nsec
t
reply
-- --
t
ack
500
nsec
10
us
t
nbusy
0 --
t
next
0 --
t
tout
* -- 120
nsec
t
tin
** -- 200
nsec