Epson ActionScanner II Manual - Halaman 3
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Parallel Interface Specifications
Interface type:
Bidirectional parallel
Data format:
8-bit parallel
Synchronization:
By external strobe pulse
Handshaking:
By ACKNLG and BUSY signals
Logic level:
Input/output data and interface control signals are TTL-level
compatible
Connector type:
36-pin Centronics
type connector
®
Connector pin arrangement:
18
36
Timing Charts
The figures below show the timing for the bidirectional parallel
interface as viewed from the scanner.
OUT (from scanner to computer)
STROBE (O)
BUSY (I)
min 250 ns
ACKNLG (I)
DATA (I)
DIR (O)
IN (from computer to scanner)
min 0.5 us I
STROBE (O)
BUSY (I)
ACKNLG (I)
DATA (I)
min 0.5 us I
DIR (O)
Scanners
1
19
min 0.5 us I
(output)
typ 5 us I
min 0.5 us I
min 0.5 us I
(output)
min 0.5 us I
Signal pin assignments
Pin
Return
No.
Pin
Signal
1
19
STROBE
2
20
DATA0
3
21
DATA1
4
22
DATA2
5
23
DATA3
6
24
DATA4
7
25
DATA5
8
26
DATA6
9
27
DATA7
10
28
ACKNLG
11
29
BUSY
−
12
15
NC
16
GND
17
C-GND
18
NC
−
19
30
GND
31
INIT
32
NC
33
GND
−
34
35
NC
36
DIR
Return Pin denotes the twisted-pair return, to be connected at signal ground level.
For interface wiring, be sure to use a twisted-pair cable for each signal, and to
complete the connection on the return side. These cables should be shielded and the
ground connected to the chassis of the host computer and the scanner.
All interface conditions are based on TTL level.
10/95
EPSON ACTIONSCANNER II
Direction
Function
IN
STROBE pulse to read in or send out
data. Pulse width must be more than
0.5 microseconds at the receiving
terminal.
IN/OUT
These signals represent information
IN/OUT
of bits 1 to 8 respectively. Each
IN/OUT
signal is at a high level when data is
IN/OUT
logical 1 and low when it is logical 0.
IN/OUT
IN/OUT
IN/OUT
IN/OUT
OUT
About a 12-microsecond pulse. Low
indicates that data has been received
and that the scanner is ready to
accept more data.
OUT
When this signal is high, the scanner
cannot receive or send data. The
signal is high:
1) during data entry
2) when the scanner is not ready
3) when the scanner has an error
Not used
Logical ground level
Scanner chassis ground
Not used
Twisted-pair return signal ground
level
IN
When this signal level becomes low,
the scanner is reset to the state
when power is turned on. This level
is usually High. The pulse width
must be more than 50
microseconds at the receiving
terminal.
Not used
Twisted-pair return signal ground
level
Not used
IN
Low indicates the direction is input
ActionScanner II-3