Epson 680Pro Service Manual - Page 17

Parallel Interface (Reserve Channel), Table 1-7. Connector Pin Assignment and Signals

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EPSON Stylus COLOR 680/777/777i 1.3.2 Parallel Interface (Reserve Channel) Transmission Mode: Adaptable Connector Synchronization: Handshaking: Data Trans. Timing: Signal Level: IEEE-1284 nibble mode See forward channel. Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification Refer to the IEEE-1284 specification IEEE-1284 level 1 device See forward channel. Table 1-7. Connector Pin Assignment and Signals Pin No. Signal Name Return GND Pin In/Out Functional Description 1 HostClk 19 In Host clock signal. 2 DATA0 20 In 3 DATA1 21 In The DATA0 through DATA7 signals 4 DATA2 22 In represent data bits 0 to 7, respectively. Each signal is at high level when data is 5 DATA3 23 In logical 1 and low level when data is 6 DATA4 24 In logical 0. These signals are used to transfer the 7 DATA5 25 In 1284 extensibility request values to the 8 DATA6 26 In printer. 9 DATA7 27 In 10 PtrClk 28 Out Printer clock signal. 11 PtrBusy / DataBit-3,7 29 Out Printer busy signal and reverse channel transfer data bit 3 or 7. 12 AckDataReq / DataBit-2,6 28 Out Acknowledge data request signal and reverse channel transfer data bit 2 or 6. 13 Xflag / DataBit-1,5 28 Out X-flag signal and reverse channel transfer data bit 1 or 5. 14 HostBusy 30 In Host busy signal. 31 -INIT 30 In Not used. Revision B Table 1-7. Connector Pin Assignment and Signals (continued) Pin No. Signal Name Return GND Pin In/Out Functional Description 32 -DataAvail / DataBit-0,4 29 Out Data available signal and reverse channel transfer data bit 0 or 4. 36 1284-Active 30 In 1284 active signal. 18 Logic-H - Out Pulled up to +5V via 3.9K ohm resistor. 35 +5V - Out Pulled up to +5V via 3.3K ohm resistor. 17 Chassis GND - - Chassis GND 16,33, GND - - Signal GND 19-30 15,34 NC - - Not connected NOTE: In/Out refers to the direction of signal flow from the printer's point of view. Extensibility Request: The printer responds affirmatively when the extensibility request values are 00H or 04H, which means, 00H: 04H: Request Nibble Mode Reverse Channel Transfer. Request Device ID; Return Data Using Nibble Mode Rev Channel Transfer. PRODUCT DESCRIPTION INTERFACE 17

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EPSON Stylus COLOR 680/777/777i
Revision B
PRODUCT DESCRIPTION
INTERFACE
17
1.3.2 Parallel Interface (Reserve Channel)
Transmission Mode:
IEEE-1284 nibble mode
Adaptable Connector
See forward channel.
Synchronization:
Refer to the IEEE-1284 specification
Handshaking:
Refer to the IEEE-1284 specification
Data Trans. Timing:
Refer to the IEEE-1284 specification
Signal Level:
IEEE-1284 level 1 device
See forward channel.
NOTE:
In/Out refers to the direction of signal flow from the printer’s point of
view.
Extensibility Request:
The printer responds affirmatively when the extensibility request values are 00H or
04H, which means,
00H:
Request Nibble Mode Reverse Channel Transfer.
04H:
Request Device ID;
Return Data Using Nibble Mode Rev Channel Transfer.
Table 1-7. Connector Pin Assignment and Signals
Pin No.
Signal Name
Return
GND Pin
In/Out
Functional Description
1
HostClk
19
In
Host clock signal.
2
DATA0
20
In
The DATA0 through DATA7 signals
represent data bits 0 to 7, 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.
3
DATA1
21
In
4
DATA2
22
In
5
DATA3
23
In
6
DATA4
24
In
7
DATA5
25
In
8
DATA6
26
In
9
DATA7
27
In
10
PtrClk
28
Out
Printer clock signal.
11
PtrBusy /
DataBit-3,7
29
Out
Printer busy signal and reverse channel
transfer data bit 3 or 7.
12
AckDataReq
/ DataBit-2,6
28
Out
Acknowledge data request signal and
reverse channel transfer data bit 2 or 6.
13
Xflag /
DataBit-1,5
28
Out
X-flag signal and reverse channel
transfer data bit 1 or 5.
14
HostBusy
30
In
Host busy signal.
31
-INIT
30
In
Not used.
32
-DataAvail /
DataBit-0,4
29
Out
Data available signal and reverse channel
transfer data bit 0 or 4.
36
1284-Active
30
In
1284 active signal.
18
Logic-H
-
Out
Pulled up to +5V via 3.9K ohm resistor.
35
+5V
-
Out
Pulled up to +5V via 3.3K ohm resistor.
17
Chassis GND
-
-
Chassis GND
16,33,
19-30
GND
-
-
Signal GND
15,34
NC
-
-
Not connected
Table 1-7. Connector Pin Assignment and Signals (continued)
Pin No.
Signal Name
Return
GND Pin
In/Out
Functional Description