Canon multipass c3000 Service Manual (en)

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2.10.2 Structure
a) Centronics uni-directional interface (Compatibility mode)
See 
Part 2: Printer, Chapter 1: 2.2 Interface Specifications on page 1-5
.
b) Bi-Centronics Interface (Nibble mode)
In Nibble mode, the host computer sends data to the facsimile using the 8-bit data line as
used for the Centronics interface.  However, the facsimile transfers data to the host
computer using the four status signal lines by dividing 8-bit data into 4 bits and sending
them.  
b-1) Pin Assignment
The following table lists the signals and input/output status of the pin assignments used
for parallel communication.
1 All RETs are connected to GND.
2 These signals are valid only in Epson LQ printer control mode.
3 The level is raised to +5.0V at 3.3k
Ω
register.
4 The level is raised to +5V at 390
Ω
register.
Part 2: Printer
2-12
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
No.
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Signal
(STROBE)
HOSTCLK
(DATA 1)
(DATA 2)
(DATA 3)
(DATA 4)
(DATA 5)
(DATA 6)
(DATA 7)
(DATA 8)
(ACKNLG)
PTRCLK
(BUSY) PTRBUSY
(P.E.)
ACK DATA REQ
(SELECT) xflog
(AUTO FEED XT
2
)
HOST BUSY
NO CONNECTION
GND
GND
PERIPHERAL
LOGIC HIGH
4
Signal
STROBE-RET
DATA 1-RET
DATA 2-RET
DATA 3-RET
DATA 4-RET
DATA 5-RET
DATA 6-RET
DATA 7-RET
DATA 8-RET
ACKNLG-RET
BUSY-RET
PAPER END-RET
INIT
ERROR
DATA AVAILABLE
GND
NO CONNECTION
+5.0V
3
SELECT IN
2
I/O
IN
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
IN/OUT
OUT
OUT
OUT
OUT
I/O
IN
OUT
OUT