Epson LX-300 - Unpacking the Printer

LX-3(3O Service Manual
Prvduct Description
1.3 INTERFACE SPECIFICATIONS
LX-300 has parallel interface and serial interface, one of which can be selected in default setting
mode. Auto selection is also available.
1.3.1 Parallel Interface Specifications
The LX-300 is equipped with an 8-bit parallel interface, standard.
Data format:
8-bit parallel
Synchronization:
By SIROBE pulse SyIIChrOIliZZItiOll
Handshaking:
By BUSY and
ACKNLG signals
Signal level:
TTL-compatible level
Adaptable
comectm
%-pm 57-30360 (Amphenol) or equivalent
Data transmission timing:
See Figure 1-7.
BUSY
ACKNLG
DATA
STROBE —
—
—
h
0.5 ps (minimum)
0.5 ps (minimum)
0.5 IIS (minimum)
Figure 1-7. Data Transmission Timing
Note:
Transition time (rise time and fall time) of every input signal must be less than 0.2 M.
The Busy signal is active (HIGH) under the following conditions:
- During data reception (See Figure 1-7.)
- When the
innt buffer is full
- When the INIT input signal is active
- During initialization
- When the ERROR signal is active
- During the self-test mode
- During the default-setting mode
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