Epson Stylus COLOR 3000 User Manual page 254

Pin assignments
The parallel interface connector pin assignments and a description of the
interface signals are shown in the table below.
Signal Return
Pin Pin
1 19
2
20
3 21
4 22
5 23
6 24
7 25
8 26
9 27
10 28
11 29
12 28
13 28
14 30
15
16
17
18
19-30
31 30
D-16
Specifications
Signal
HostClk
DATA 0
DATA 1
DATA 2
DATA 3
DATA 4
DATA 5
DATA 6
DATA 7
PtrClk
PtrBusy/
DataBit - 3, 7
AckDataReq/
DataBit - 2, 6
Xflag/
DataBit - 1, 5
HostBusy
- NC
- GND
- CHASSIS
GND
- Logic H
- GND
INIT
Direction Description
IN Host clock signal.
IN These signals represent
IN information in bits 0 to 7
IN of parallel data
IN respectively. Each signal
IN is at HIGH level when
IN data is logical 1 and
IN LOW when it is logical 0.
IN These signals are used to
transfer the 1284
extensibility request
values to the printer.
OUT Printer clock signal.
OUT Printer busy signal and
reverse channel transfer
data bit 3 or 7.
OUT Acknowledge data
request signal and
reverse channel transfer
data bit 2 or 6.
OUT X-flag signal and reverse
channel transfer data bit
1 or 5
IN Host busy signal.
- Not used
- Logic ground level
- Printer's chassis ground,
which is connected to
the logic ground.
OUT Pulled up to +5 V through
3.9 k resistance
- Logic ground level
IN Not used.