Interface Specifications; Parallel Interface (Forward Channel) - Epson LX-300+ Service Manual

LX-300+/1170

1.3 Interface Specifications

LX-300+/1170 provides bi-directional 8 bit parallel interface and serial interface. Optional
interface board is not supported on this model.

1.3.1 Parallel Interface (Forward Channel)

o
Transmission mode:
o
Adaptable connector:
o
Synchronization:
o
Handshaking:
o
Signal level:
Table 1-10. 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
NOTE: * 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
Ω
.
Table 1-11. 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
t
ack
=2.0V
IH
t
nbusy
=0.8V
IL
t
next
t
tout
t **
tin
NOTE: * Rise and fall time of output signals.
** Rise and fall time of input signals.
Interface Specifications
Figure 1-6. 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
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