Interface Overview; Parallel Interface; Data Transmission Timing - Epson SQ-1170 Service Manual

1.3 INTERFACE OVERVIEW

The printer has a parallel interface with the

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
Signal Name
No.
STROBE
2 DATA 1
3 DATA 2
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
specifications described below.
8-bit parallel
STROBE signal
BUSY and ACKNLG signal
57-30360 (Amphenol)
See Figure 1-9.
[
min.
min.
min.
1-9. Data Transmission Timing
Figure
Return Dir.
Pin No.
19 IN STROBE pulse to read the input data. Pulse width must
be more than 0.5Ks. Input data is latched at falling
edge of this signal.
20 IN Parallel input data to the printer.
21 IN HIGH level means " 1".
22 IN LOW level means "O".
23 IN
24 IN
25 IN
IN
26
28 OUT This pulse indicates data has been received and the
printer is ready to accept more data. Pulse width is
approximately 1 Ips.
29 HIGH indicates the printer cannot accept more data.
OUT
3 0
OUT HIGH indicates paper out. This signal is effective only
when the ERROR signal is LOW,
Always HIGH output (Pulled up to +5V through a 3.3K
OUT
ohm resistor.)
1-14
or equivalent
, /
typ. '
Functional Description
,-.' ,
. .