REV.-A
GENERAL DESCRIPTION
The standard 8-bit parallel interface has the following specifications:
Data Format
Synchronization
Handshaking
Signal Level
Connector
Data Transmission Timing
8-bit parallel
By STROBE pulse
By BUSY and ACKNLG signals
TTL-compatible
57-30360 (Amphenol) or equivalent
See Figure 1-7.
BUSY
ACKNLG
DATA
STROBE
0.5jfs
0.5jJs
0.5@
5Ifs
5M
<
LD
<
min.
min.
min. typ.
typ.
Figure 1-7. Data Transmission Timing
Table 1-9 shows the connector pin assignments and signal functions of the 8-bit parallel interface.
Table 1-9. Connector Pin Assignments and Signal Functions
Pin No.
Signal Name
Return
Pin No.
Dir.
Functional Description
1
STROBE
19 In
Strobe pulse to read the input data. Pulse width must
be more than 0.5
ps.
Input data is latched at the fall-
ing edge of this signal.
2 DATA 1
20
In
Parallel input data to the printer.
3
DATA 2
21
In
“HIGH” level means data “1.”
4
DATA 3
22
In
“LOW” level means data “0.”
5
DATA 4
23
In
6
DATA 5
24
In
7
DATA 6
25
In
8
DATA 7
26
In
9
DATA 8
27
In
10
ACKNLG
28
out
This pulse indicates data was received and the printer
is ready to accept more data. Pulse width is 11
ps,
approximate.
11
BUSY
29
out
“HIGH” indicates the printer cannot accept more
data.
LQ-510
1-13
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