Parallel Interface (Reserve Channel) - Epson Stylus COLOR 880 Service Manual

EPSON Stylus COLOR 880

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.
Table 1-7. Connector Pin Assignment and Signals
Signal Return
Pin No.
Name GND Pin
1 HostClk 19
2 DATA0 20
3 DATA1 21
4 DATA2 22
5 DATA3 23
6 DATA4 24
7 DATA5 25
8 DATA6 26
9 DATA7 27
10 PtrClk 28
PtrBusy /
11 29
DataBit-3,7
AckDataReq
12 28
/ DataBit-2,6
Xflag /
13 28
DataBit-1,5
14 HostBusy 30
31 -INIT 30
PRODUCT DESCRIPTION
In/Out Functional Description
In Host clock signal.
In
The DATA0 through DATA7 signals
In
represent data bits 0 to 7,
In
respectively.
Each signal is at high level when data
In
is logical 1 and low level when data is
In
logical 0.
These signals are used to transfer
In
the 1284 extensibility request values
In
to the printer.
In
Out Printer clock signal.
Printer busy signal and reverse
Out
channel transfer data bit 3 or 7.
Acknowledge data request signal
Out and reverse channel transfer data bit
2 or 6.
X-flag signal and reverse channel
Out
transfer data bit 1 or 5.
In Host busy signal.
In Not used.
Table 1-7. Connector Pin Assignment and Signals (continued)
Signal
Pin No.
Name
-DataAvail /
32
DataBit-0,4
36 1284-Active
18 Logic-H
35 +5V
Chassis
17
GND
16,33,
GND
19-30
15,34 NC
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.
INTERFACE
Return
In/Out Functional Description
GND Pin
Data available signal and reverse
29 Out
channel transfer data bit 0 or 4.
30 In 1284 active signal.
Pulled up to +5V via 3.9K ohm
- Out
resistor.
Pulled up to +5V via 3.3K ohm
- Out
resistor.
- - Chassis GND
- - Signal GND
- - Not connected
Revision A
18