Epson Stylus Photo 870 Service Manual page 110

EPSON Stylus Photo 870/1270
Table 6-11. Pin Assignment and Signals (Forward Channel)
Pin Return
Signal In/Out*
no. GND pin
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 /ACKNLG 28
11 BUSY 29
12 PE 28
13 SLCT 28
14 /AFXT 30
31 /INIT 30
32 /ERROR 29
36 /SLIN 30
18 Logic H —
35 +5V —
Description
In The DATA0 through DATA7 signals
represent data bits 0 to 7,
In
respectively; each signal is HIGH
when data is logical 1 and LOW when
In
data is logical 0
In
In
In
In
In
Out This signal is a negative pulse
indicating that the printer can accept
data again
Out A HIGH signal indicates that the
printer cannot receive data
Out A HIGH signal indicates a Paper Out
error
Out Always HIGH when the printer is
turned on
In Not used
In The falling edge of a negative pulse or
a LOW signal on this line causes the
printer to initialize; a minimum 50µs
pulse is necessary
Out A LOW signal indicates printer error
In Not used
Out Pulled up to +5V via 3.9 K ohm resistor
Out Pulled up to +5V via 3.3K ohm resistor
Table 6-11. Pin Assignment and Signals (Forward Channel)
Pin Return
Signal In/Out*
no. GND pin
17 Chassis —
GND
16,33, GND —
19-30
15,34 NC —
* In/Out refers to the direction of the signal as viewed from the printer.
6.9.14.2 Parallel Interface (Reverse Channel)
! Transmission mode:
! Adaptable connector:
! Synchronization:
! Handshaking:
! Data transmission timing: Refer to the IEEE-1284 specification
! Signal level:
! Extensibility request
The printer responds affirmatively when the extensibility request
values are 00H or 04H, which mean:
00H:
Channel Transfer.
04H:
Rev Channel Transfer.
! Device ID
The printer sends one of the following device ID strings upon
request.
When IEEE1284.4 is enabled,
Stylus COLOR 860)
Chapter 7 Appendix
Description
— Chassis GND
— Signal GND
— Not connected
IEEE-1284 nibble mode
See page 103.
Refer to the IEEE-1284 specification
Refer to the IEEE-1284 specification
IEEE-1284 level 1 device
(see page 103)
Request Nibble Mode Reverse
Request device ID;
Return Data Using Nibble Mode
[00H] [5AH] (for the EPSON
[00H] [5CH] (for the EPSON
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