Interface Specifications; Parallel Interface (Forward Channel) - Epson LQ-570e Service Manual

EPSON LQ-570e/LQ-580

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:
o Adaptable connector:
o Synchronization:
o Handshaking:
o Signal level:
Table 1-20. Parameter
Parameter Minimum
V * --
OH
V * -0.5V
OL
I * --
OH
I * --
OL
C --
O
V --
IH
V 0.8V
IL
I --
IH
I --
IL
C --
I
* 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
Product Description
8 bit parallel
IEEE-1284 compatibility mode
57-30360 (Amphenol) or equivalent
-STROBE pulse
BUSY and -ACKLG signals
TTL compatible
(IEEE-1284 level 1 device)
Maximum Condition
5.5V
--
0.32mA V
12mA V
50pF
2.0V
--
0.32mA V
12mA V
50pF
Table 1-21. Maximum & Minimum Timings for Data Transmission
Parameter
t
setup
t
hold
=2.4V
OH
t
stb
=2.4V
OL
t
ready
t
busy
t
reply
ack
t
=2.0V
IH
t
nbusy
=0.8V
IL
t
next
t
tout
t **
tin
Ω
.
* Rise and fall time of output signals
** Rise and fall time of input signals.
Interface Specifications
Figure 1-7. Data Transmitting Timing
Minimum
500 nsec
500 nsec
500 nsec
0
--
--
500 nsec
0
0
* --
--
Revision C
Maximum
--
--
--
--
500 nsec
--
10 us
--
--
120 nsec
200 nsec
25