Product Description
Rev. A
1-17
1.3.1.2 Reverse Channel Specifications
Transmission mode
:IEEE-1284 nibble mode
Adaptable connector
:Same as for the forward channel
Synchronization
:Refer to the IEEE-1284 specification
Handshaking
:Refer to the IEEE-1284 specification
Data transmission timing
:Refer to the IEEE-1284 specification
Signal level
:IEEE-1284 level 1 device
See the forward channel specification.
Table 1-18 shows the connector pin assignment and signals for reverse channel of the parallel interface.
Pin No.
Signal Name
Return
GND Pin
I/O
Description
1
HostClk
19
I
Clock signal from the host computer.
2-9
DATA 0-7
20-27
I
These signals represent parallel data
information on bits 2 to 9.Each signal is
High when the data is logical 1 and low
when the data is logical 0.
10
PtrClk
28
O
Clock signal from the printer
11
PtrBusy /
Data bits 3,7
29
O
Busy signal from the printer.
Data bit 3 or 7 in reverse channel.
12
AckDatareq /
AckData Bits 2,6
28
O
Acknowledge request signal.
Data bit 2 or 6 in reverse channel.
13
Xflag/Data bit 1,5
28
O
X flag signal.
Data bit 1 or 5 in reverse channel.
14
HostBusy
30
I
Busy signal from the host computer
31
/INIT
30
I
Not used
32
/Data Avail /
Data bits 0,4
29
O
Data available signal.
Data bit 0 or 4 in reverse channel.
36
1284-Active
30
I
1284 active signal.
18
Logic-H
-
O
Pulled up to +5V via 3.9 K ohm resistor.
35
+5V
-
O
Pulled up to +5V via 3.3 K ohm resistor.
17
Chassis GND
-
-
Chassis ground for the printer.
16,33,19-30
GND
-
-
Signalground.
15,34
NC
-
-
Not connected.
Note) The symbol */* at the beginning of a signal means active low.
Extensibility Request
The printer responds affirmatively when the extensibility request values are 00H or 04H, as follows:
00H
:Request Nibble Mode Reverse Channel Transfer.
04H
:Request Device ID;
Return Data Using Nibble Mode Rev Channel Transfer.
Device ID
The printer sends following device ID string when it is requested.
[00H] [xxH]
MFG
:EPSON;
CMD
:ESCP2E, PRPXL;
MDL
:Stylus COLOR 1520;
CLS
:PRINTER
Note) [00H] denotes a hexadecimal values of zero.
Table 1-18. Connector Pin Assignment and Signals (Reverse Channel)
Summary of Contents for 1520 - Stylus Color Inkjet Printer
Page 138: ...Maintenance Rev A 6 5 8 9 10 10 10 10 10 10 10 10 Figure 6 2 Lubrication Points 2 ...
Page 146: ...Appendix Rev A A 7 A 2 Circuit Diagrams Figure A A 2 C211 MAIN B Board Circuit Diagram 1 2 ...
Page 147: ...EPSON Stylus COLOR 1520 Rev A A 8 ...
Page 148: ...Appendix Rev A A 9 Figure A A 3 C211 MAIN B Board Circuit Diagram 2 2 ...
Page 149: ...EPSON Stylus COLOR 1520 Rev A A 10 ...
Page 152: ...Appendix Rev A A 13 A 3 Component Layout Figure A A 6 C211 MAIN B Board Component Layout ...
Page 153: ...EPSON Stylus COLOR 1520 Rev A A 14 Figure A A 7 C172 PSB Board Component Layout ...
Page 154: ...Appendix Rev A A 15 Figure A A 8 C172 PSE Board Component Layout ...
Page 156: ...Appendix Rev A A 17 Figure A A 10 Stylus COLOR 1520 Exploded Diagram 2 ...
Page 157: ...EPSON Stylus COLOR 1520 Rev A A 18 Figure A A 11 Stylus Color 1520 Exploded Diagram 3 ...
Page 165: ...EPSON SEIKO EPSON CORPORATION ...
