Parallel Interface Circuit; Circuit; Optional Type-B Interface; Figure 2 - 1 1 - Epson EPL-5000 Service Manual

2.2.1.5 Parallel Interface Circuit

Figure 2-41 shows the parallel interface circuit block diagram. Data sent from the host computer is
latched within the
automatically to stop the host computer from sending
signal after reading the data from the
the host computer.
2.2.1.6
This circuit uses the
signal
The
does not have an
at initialization. In a printer with an
is
If the
model with no built-in
interface (model
the circuit to change serial data to parallel.
models with a built-in
non-intelligent optional serial interface (model C82305*/C82306*).

2.2.1.7 Optional Type-B Interface

d
This printer supports an Epson Type-B
signals from the
Rev.
Lasar
by the STROBE signal.
DATA
STROBE
BUSY
Figure 2-41. Parallel Interface Circuit

Circuit

receiver/driver
(-12 or
to the signal level. This
standard cell changes serial
up to +5 The CPU checks the
ter is LOW, the CPU assumes that the printer is a model with no
(the ActionLaser 1000) can use a non-intelligent optional serial
interface (the
Signal
Figure 2-42.
standard
Manual
The
so that the printer is ready to receive more data from
Latch
. . . . . . .
. . . . . . .
to the signal
converts +5
data to parallel data. Since the
the CPU must check the
interface, the
termina (pin
This optional interface also uses the
and ActionLaser 1500) cannot use the
Data
Transmit
Circuit
interface,
optional which
outputs the BUSY signal
data. The CPU resets the BUSY
to change the signal level from the
(O V or +5 V) or from the
to +12 and -12
type for an
terminal (pin 16) for the
for at initialization.
standard cell as
Interface
Interface
is controlled by the
1000
interface
The
and BIF
2-21