Epson Stylus Color 640 Service Manual page 28

EPSON Stylus Color 440/640/740
Pin No.
1
2-9
10
11
12
13
14
31
32
36
18
35
17
16,33, 9-30
15,34
Note) In/Out refers to the direction of signal flow from the printer's point of view.
Chapter 1 Product Description
Table 1-12. Parallel I/F Reverse Channel
Return GND
Signal Name
Pin
HostClk 19
Data0-7 20-27
PrtClk 28
PtrBusy, Data Bit-3,7 29
AckData Req, DataBit-2,6 28
Xflag, DataBit-1,5 28
HostBusy 30
/INIT 30
/DataAvail, DataBit-0,4 29
1284-Active 30
Logic-H ----
+5V ----
Chassis GND ----
GND ----
NC ----
In/Out Functional Description
I Host clock signal.
The DATA0 through DATA7 signals represent data
bits 0 to7, respectively. Each signal is at high level
I 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.
O Printer clock signal.
Printer busy signal and reverse channel transfer data
O
bit 3 or 7.
Acknowledge data request signal and reverse channel
O
transfer data bit 2 or 6.
X-flag signal and reverse channel transfer data bit 1 or
O
5.
I Host busy signal.
I Not used.
Data available signal and reverse channel transfer
O
data bit 0 or 4.
I 1284 Active Signal
O Pulled up to +5V via 3.9K ohm resister.
O Pulled up to +5V via 3.3K ohm resister.
--- Chassis GND.
--- Signal GND.
--- Not connected.
Revision A
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