Epson GT-9000 Service Manual page 15

Table 1-2. Pin Assignments for the Bidlrectionai Paraiiel Interface
Pin No. Signal Name
1 STROBE
2-9
10
ACKNLG
11 BUSY
12-15 NC
16
17
18 NC
31
32 NC
33
34-35 NC
36 DIR
The STROBE pulse used to read in or send out data. Pulse
I
width at the receiving terminal must exceed 0.5 p.s.
These signals convey the Ist to 8th bits of data.
I/o
level indicates a logical 1; a LOW level indicates a logical O.
A pulse of approx. 12 W. A LOW level indicates that data
o has been received and the scanner is ready to accept mom
data.
When this signal is HIGH, the scanner cannot receive data.
The signal beoomes HIGH:
1 during data entry
o
—
Not used
—
Logic ground level
.
Scanner chassis ground
.
Not used
—
Twisted-pair return signal
When this signal level becomes LOW, the scanner is reset
to its power on state. This level is usually HIGH. The pulse
I
width at the receiving terminal must be greater than 50 ~.
—
Not used
—
Twisted-pair return signal ground level
.
Not used
A LOW indicates that the direction is input.
Description
ground level
HIGH
A
Rev. A