Epson Stylus COLOR 3000 Service Manual - Page 26

Reverse Channel, Table 1-23. Connector Pin Assignment and Signals Reverse Channel

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EPSON Stylus COLOR 3000 Reverse Channel Transmission mode IEEE-1284 nibble mode Adaptable connector Same as 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 forward channel. Table 1-23 shows the connector pin assignment and signals for reverse channel of the parallel interface. Table 1-23. Connector Pin Assignment and Signals (Reverse Channel) Pin No. Signal Name Return GND Pin I/O Description 1 HostClk 2-9 DATA 0-7 19 20-27 I Clock signal from the host computer. These signals represent parallel data on I 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 PtrBusy / 11 Data bits 3,7 Busy signal from the printer. 29 O Data bit 3 or 7 in reverse channel. AckDatareq / Acknowledge request signal. 12 AckData Bits 2,6 28 O Data bit 2 or 6 in reverse channel. X flag signal. 13 Xflag/Data bit 1,5 28 O Data bit 1 or 5 in reverse channel. 14 HostBusy 30 I Busy signal from the host computer 31 /INIT 30 I Not used /Data Avail / 32 Data bits 0,4 Data available signal. 29 O 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) 1. */* at the beginning of a signal means active low. 2. The I/O column indicates the direction of the signal as viewed form the printer. 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 using Nibble Mode Rev Channel Transfer Device ID The printer sends following device ID string upon request: Note) [00H] [xxH] MFG EPSON; CMD ESCPL2, PRPXL, BDC; MDL Stylus [SP]COLOR[SP] 3000; CLS PRINTER; [00H] denotes a hexadecimal values of zero. Rev. A 1-19

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EPSON Stylus COLOR 3000
Rev. A
1-19
Reverse Channel
Transmission mode
IEEE-1284 nibble mode
Adaptable connector
Same as 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 forward channel.
Table 1-23 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 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)
1. */* at the beginning of a signal means active low.
2. The I/O column indicates the direction of the signal as viewed form the printer.
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 using Nibble Mode Rev Channel Transfer
Device ID
The printer sends following device ID string upon request:
[00H] [xxH]
MFG
EPSON;
CMD
ESCPL2, PRPXL, BDC;
MDL
Stylus [SP]COLOR[SP] 3000;
CLS
PRINTER;
Note)
[00H] denotes a hexadecimal values of zero.
Table 1-23. Connector Pin Assignment and Signals (Reverse Channel)