Epson Stylus Photo 870 Service Manual page 111

EPSON Stylus Photo 870/1270
Stylus COLOR 1270)
1270;
EPSON[SP]Stylus[SP]COLOR[SP]870/1270;
When IEEE1284.4 is disabled,
Stylus COLOR 860)
Stylus COLOR 1270)
1270;
EPSON[SP]Stylus[SP]COLOR[SP]870/1270;
NOTE: [00H] denotes a hexadecimal value of zero.
MDL value depends on the EEPROM setting.
CMD value depends on the IEEE1284.4 setting.
Table 6-12 shows the pin assignments for the reverse channel of the
parallel interface.
MFG:EPSON;
CMD: ESCPL2, BDC, D4;
MDL: Stylus[SP]COLOR[SP]870/
CLS:PRINTER;
DES:
[00H] [57H] (for the EPSON
[00H] [59H] (for the EPSON
MFG: EPSON;
CMD: ESCPL2, BDC;
MDL: Stylus[SP]COLOR[SP]870/
CLS: PRINTER;
DES:
Table 6-12. Pin Assignments and Signals (Reverse Channel)
Pin Return
Signal In/Out
no. 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 Out
11 PtrBusy / 29 Out
DataBit-3,7
12 AckDataRe 28 Out
q / DataBit-
2,6
13 Xflag / 28 Out
DataBit-1,5
14 HostBusy 30
31 -INIT 30
32 -DataAvail / 29 Out
DataBit-0,4
36 1284- 30
Active
18 Logic-H — Out
35 +5V — Out
Chapter 7 Appendix
Description
In Host clock signal
In The DATA0 through DATA7 signals
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 the
In
1284 extensibility request values to
the printer.
In
In
In
Printer clock signal
Printer busy signal and reverse
channel transfer data bit 3 or 7
Acknowledge data request signal and
reverse channel transfer data bit 2 or 6
X-flag signal and reverse channel
transfer data bit 1 or 5
In Host busy signal
In Not used
Data available signal and reverse
channel transfer data bit 0 or 4
In 1284 active signal
Pulled up to +5V via 3.9K ohm resistor
Pulled up to +5V via 3.3K ohm resistor
106