Parallel Interface; Data Transmission Timing; Table 1-11. Connector Pin Assignments And Signal Functions - Epson LQ-1170 Service Manual

1.3 PARALLEL INTERFACE

The specifications for the printer's 8-bit parallel
Data format
Synchronization
Handshaking
Adaptable connector

Data transmission timing

BUSy
DATA
STROBE
Table 1-11 provides the connector pin assignments and describes the signal functions of the 8-bit parallel interface.
Pin No.
DATA 1
2
DATA 2
3
4 DATA 3
DATA 4
5
DATA 5
6
DATA 6
7
DATA 7
8
DATA 8
9
10
BUSY
PE
12
SLCT
13
interface are as follows:
8-bit parallel
/STROBE signal
BUSY and /ACKNLG signal
57-30360 (AmphenOl)
[
Figure 1-6. Data Transmission Timing

Table 1-11. Connector Pin Assignments and Signal Functions

Return
Pin No.
19
20
21
22
23
24
25
26
27
28
29
30
—
or equivalent
/
,
Dir.
IN
must be more than 0.5 #s. Input data is latched at
the falling edge of this signal.
Parallel input data to the printer.
IN
HIGH level means data 1.
IN
LOW level means data O.
IN
IN
IN
IN
IN
IN
This pulse indicates data has been received and
OUT
the printer is ready to accept more data. Pulse
width is approximately 11 KS.
HIGH indicates the printer cannot accept more
OUT
data.
HIGH indicates paper out. This signal is effective
OUT
only when the ERROR signal is LOW.
Always
output. (Pulled
OUT HIGH
S. SK-ohm resistor.)
1-14
Function
Pulse width
up to +5 V through a