Epson FX 1170 Service Manual - Page 24

Interface, 3.1 Parallel Interface

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

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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