Epson Stylus Pro 9000 Service Manual - Page 167

Table 7-9., Pin Assignment for Reverse Channel

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EPSON Stylus Pro 9000 Pin No. Signal Name 1 HostClk 2-9 Data0-7 10 PeriphClk 11 PeriphAck/PtrBusy 12 AckData Req 13 Xflag 14 HostBusy 15 NC 16 GND 17 Chassis GND 18 Logic-H 19-30 GND 31 INIT 32 DataAvail 33 GND 34 NC 35 +5V 36 1284-Active Table 7-9. Pin Assignment for Reverse Channel Return Direction GND Pin Functional Description 19 In Host clock signal. 20-27 The DATA0 through DATA7 signals represent data bits 0 to7, respectively. Each signal is at high level when data is logical In 1 and low level when data is logical 0. These signals are used to transfer the 1284 extensibility request values to the printer. 28 Out Printer clock signal. 29 Out Printer busy signal and reverse channel transfer data bit 3 or 7. 28 Out Acknowledge data request signal and reverse channel transfer data bit 2 or 6. 28 Out X-flag signal and reverse channel transfer data bit 1 or 5. 30 In Host busy signal. Not connected. Signal ground. Chassis ground. Out Pulled up to +5V via 3.9K ohm resister. Ground for twisted pair return. 30 In Not used. 29 Out Data available signal and reverse channel transfer data bit 0 or 4. Ground for twisted pair return. Not connected. - Out Pulled up to +5V via 3.3K ohm resister. 30 In 1284 Active Signal. Appendix 167

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EPSON Stylus Pro 9000
Appendix
167
Table 7-9.
Pin Assignment for Reverse Channel
Pin No.
Signal Name
Return
GND Pin
Direction
Functional Description
1
HostClk
19
In
Host clock signal.
2-9
Data0-7
20-27
In
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.
10
PeriphClk
28
Out
Printer clock signal.
11
PeriphAck/PtrBusy
29
Out
Printer busy signal and reverse channel transfer data bit 3 or 7.
12
AckData Req
28
Out
Acknowledge data request signal and reverse channel transfer data bit 2 or 6.
13
Xflag
28
Out
X-flag signal and reverse channel transfer data bit 1 or 5.
14
HostBusy
30
In
Host busy signal.
15
NC
Not connected.
16
GND
Signal ground.
17
Chassis GND
Chassis ground.
18
Logic-H
Out
Pulled up to +5V via 3.9K ohm resister.
19-30
GND
Ground for twisted pair return.
31
INIT
30
In
Not used.
32
DataAvail
29
Out
Data available signal and reverse channel transfer data bit 0 or 4.
33
GND
Ground for twisted pair return.
34
NC
Not connected.
35
+5V
—
Out
Pulled up to +5V via 3.3K ohm resister.
36
1284-Active
30
In
1284 Active Signal.