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

EPSON LX-300+II/300+II RTP/1170II

1.3 Interface Specifications

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

1.3.1 Parallel Interface (Forward Channel)


Transmission mode: 8 bit parallel
IEEE-1284 compatibility mode

Adaptable connector: 57-30360 (Amphenol) or equivalent

Synchronization: -STROBE pulse

Handshaking: BUSY and -ACKLG signals

Signal level: TTL compatible
(IEEE-1284 level 1 device)
Table 1-14. 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
Maximum Condition
5.5V
--
0.32mA V
OH
12mA V
OL
50pF
2.0V
--
0.32mA V
IH
12mA V
IL
50pF
Ω .
Table 1-15. Maximum & Minimum Timings for Data Transmission
Parameter
t
setup
t
hold
=2.4V
t
stb
=2.4V
t
ready
t
busy
t
reply
t
ack
=2.0V
t
nbusy
=0.8V
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 D
Maximum
--
--
--
--
500 nsec
--
10 us
--
--
120 nsec
200 nsec
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