Interface Overview; P A R A L L E L I N T E R F A C; Data Transmission Timing; Table 1-11. Connector Pin Assignments And Signal Functions - Epson LQ-1070 Service Manual

REV.-A

1.3 INTERFACE OVERVIEW

The printer has a parallel interface with the specifications described below.
1.3.1 Parallel Interface
Specifications for the 8-bit parallel interface are as follows:
Data format
Synchronization
Handshaking
Signal level
Adaptable connector

Data transmission timing

BUSY
DATA
STROBE
Table 1-11 shows the connector pin assignments and signal functions of the 8-bit parallel interface.

Table 1-11. Connector Pin Assignments and Signal Functions

Pin No.
Signal Name
1 STROBE
2 DATA 1
DATA 2
3
4 DATA 3
5 DATA 4
6 DATA 5
7 DATA 6
8 DATA 7
9 DATA 8
10
11 BUSY
12 PE
13 SLCT
8-bit parallel
STROBE signal
BUSY and ACKNLG signal
57-30360 (Amphenol)
See Figure 1-6.
min.
min.
min.
Figure 1-6. Data Transmission Timing
Return
Dir.
Pin No.
IN
19
20 IN
IN
21
IN
22
23 IN
24 IN
25 IN
IN
26
27 IN
28 OUT
29 OUT
30
OUT
—
OUT
1-14
or equivalent
Functional Description
STROBE pulse to read the input data. Pulse width must
be more than 0.5ps. Input data is latched at falling
edge of this signal.
Parallel input data to the printer.
HIGH level means data 1.
LOW level means data O.
This pulse indicates data has been received and the
printer is ready to accept more data. Pulse width is
approximately 11 Ks.
HIGH indicates the printer cannot accept more data.
HIGH indicates paper out. This signal is effective only
when the ERROR signal is LOW.
Always HIGH output. (Pulled up to +5 Vthrough a 3.3K
ohm resistor.)