Service manual

REV.-A
, 1.3 Interface
This printer has a built-in, 8-bit centronics parallel interface.
1.3.1 Parallel Interface
Data transmission mode
8-bit parallel
Synchronization
Controlled by external STROBE pulse.
Handshaking
Controlled by ACKNLG and BUSY signals.
Logic level
ITL- compatible
Connector plug
57-30360 (Amphenol) or equivalent
It is recommended that the interface cable be as
short as possible (10 feet maximum).
DATA :... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STROBE
tl tl tl
t2
t3
tl : 0.5 us (min.)
t2: 7 us
(approx.)
t3: 5 us (approx.)
Figure 1-6. Data Transmission Timing
Table 1-14. Connector Pin Assignments and Signal Functions
Signal
Return
Signal
Pin No. Pin No.
Dir.
Description
Name
1
19 STROBE In
STROBE pulse to read data in. Pulse width must be more than
0.5 Bs at receiving terminal.
2
20 DATA 1
In These signals represent the 1st to 8th bits of parallel data,
3
21
DATA 2
In respectively. Each signal is HIGH when data is a logical 1 and
4
22 DATA 3
In LOW when a logical O.
5
23 DATA 4
In
6
24 DATA 5
In
7 25
DATA 6 In
8 26
DATA 7 In
1-15