Service manual

LX-300+ Revision A
Product Description Interface Specifications 19
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)
* 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 1-6. Data Transmitting Timing
* Rise and fall time of output signals
** Rise and fall time of input signals.
Table 1-10. Parameter
Parameter Minimum Maximum Condition
V
OH
*-- 5.5V
V
OL
* -0.5V --
I
OH
*--0.32mAV
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 1-11. 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