Epson Stylus PRO Color Large Format Inkjet Printer 7000 Service Manual page 28

EPSON Stylus Pro 7000
Table 1-20. Connector Pin Assignments - ECP Mode
Pin Return In/
Signal Name
No. Pin Out
1 HostClk 19 I
2-9 Data0-7 20-27 I
PeriphClk
10 28 O
11 PeriphAck 29 O
12 nAckReverse 28 O
13 Xflag 28 O
HostAck
14 30 I
15 NC
16 GND
Chassis GND
17
PeriphLogic-
18 O
H
19-30 GND
Product Description
Functional Description
Data or address information is transferred
from the host to the printer.
The DATA0 through DATA7 signals
represent data bits 0 to7, respectively.
Each signal is at high level when data is
logical 1 and low level when data is logical
0. These signals are used to transfer the
1284 extensibility request values to the
printer.
Data is transferred from the printer to the
host.
The printer uses this signal for flow
control in the forward direction. Also used
for data bit 9 which indicates command
information and data to be output on the
data signal in the forward direction.
The printer goes to Low and approves the
nReverseRequest.Acknowledge data
request signal and reverse channel
transfer data bit 2 or 6.
X-flag signal and reverse channel transfer
data bit 1 or 5.
The host uses this signal for flow control
in the reverse direction. Also used for data
bit 9 which indicates command
information and data to be output on the
data signal in the forward directions.
Not connected
Signal ground
Chassis ground
Always HIGH. Pulled up to +5V via 3.9K
ohm resister.
Ground for twisted pair return
Table 1-20. Connector Pin Assignments - ECP Mode
Pin Return
Signal Name
No.
nReverseReq
31
uest
nPeriphRequ
32
est
GND
33
NC
34
35 +5V
1284-Active
36
Note: In (I) and Out (O) refer to the direction of signal flow from the printer's point
of view.
Interfaces
In/
Functional Description
Pin Out
This signal goes low to change to the
30 I
reverse channel.
29 O This signal produces a host interrupt.
Ground for twisted pair return
Not connected
Always HIGH. Pulled up to +5V via 1.0K
---- O
ohm resister.
1284 Active Signal. HIGH in ECP mode
30 I
Revision B
28