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

LX-300+

1.3 Interface Specifications

LX-300+ 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)

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 1-10. 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
* 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
Ω
equivalent to 7.5 k .
Product Description
Maximum Condition
5.5V
--
0.32mA V =2.4V
OH
12mA V =2.4V
OL
50pF
2.0V
--
0.32mA V =2.0V
IH
12mA V =0.8V
IL
50pF
Interface Specifications
Figure 1-6. Data Transmitting Timing
Table 1-11. Maximum & Minimum Timings for Data Transmission
Parameter
t
setup
t
hold
t
stb
t
ready
t
busy
t
reply
ack
t
t
nbusy
t
next
t *
tout
t **
tin
* Rise and fall time of output signals
** Rise and fall time of input signals.
Revision A
Minimum Maximum
500 nsec --
500 nsec --
500 nsec --
0 --
-- 500 nsec
-- --
500 nsec 10 us
0 --
0 --
-- 120 nsec
-- 200 nsec
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