￿ Signal level
Reverse Channel
￿ Transmission mode ￿ Adaptable connector ￿ Synchronization
￿ Handshaking

EPSON Stylus COLOR 3000

IEEE-1284 nibble mode

Same as forward channel

Refer to the IEEE-1284 specification

Refer to the IEEE-1284 specification

￿Data transmission timing Refer to the IEEE-1284 specification

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

I/O

Description

GND Pin

 

 

 

 

 

 

 

 

 

1

HostClk

19

I

Clock signal from the host computer.

 

 

 

 

These signals represent parallel data on

2-9

DATA 0-7

20-27

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

 

 

 

 

 

11

PtrBusy /

29

O

Busy signal from the printer.

Data bits 3,7

Data bit 3 or 7 in reverse channel.

 

 

 

12

AckDatareq /

28

O

Acknowledge request signal.

AckData Bits 2,6

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 /

29

O

Data available signal.

Data bits 0,4

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.

Rev. A

1-19