Epson LQ 300 - Chapter 1 Setting Up the Printer; Initial Setup Tasks

LQ-300 Service Manual
Product Description
1.3 INTERFACE SPECIFICATIONS
LQ-300 has a Centronics<ompatible parallel interface and an EIA-232D serial interface, one of
which can be selected in default setting mode. Auto selection is also available.
1.3.1 Parallel Interface
The parallel interface has two modes:
. Compatible mode
● Reverse mode
1.3.1.1 Compatible Mode
Data format:
8-bit parallel
Synchronization:
By STROBE pulse synchronization
Handshaking:
By BUSY and
ACKNLG signals
Signal level:
Tl_’L-compatible level (IEEE-P1284 level 1 device)
Adaptable comector:
36-pin 57-30360
(Amphenol) or equivalent
Data transmission timing:
See Figure 1-6.
Note:
Transition time (rise time and fall time) of every input signal must be less than 0.2 ps.
BUSY
ACKNLG
DATA
STROBE
—
~
.
Figure 1-6. Data Transmission Timing
The BUSY signal is active (HIGH) under the following conditions:
. During data reception (See Figure 1-6.)
● When the innt buffer is full
. When the INIT input signal is active
. During a printer error
. During the self-test mode
. During the default setting mode
. When the parallel interface is not selected
The ERROR signal is active (LOW) under the following conditions:
. When a paper-out error occurs
. When a release lever operation error occurs
● When a fatal error occurs
The PE signal is active (HIGH) under the following conditions:
● When a paper-out error occurs
.
Rev. A
1-11