Canon C5000 - MultiPASS Color Inkjet Printer, Service Manual, Page: 209 / 221

Part 2: Printer
2.10.2 Structure
a)
Centronics uni-directional interface (Compatibility mode)
See
Chapter
2.2 on page
b) Bi-Centronics Interface (Nibble mode)
In Nibble mode, the host computer sends data to the facsimile using the 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
data into 4 bits and sending
them.
b-l) Pin Assignment
The following table lists the signals and input/output status of the pin assignments used
for parallel communication
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
16
RI
(STROBE)
HOSTCLK
(DATA 1)
(DATA 2)
(DATA 3)
(DATA 4)
(DATA 5)
(DATA 6)
(DATA 7)
(DATA 8)
(ACKNLG)
PTRCLK
PTRBUSY
(P.E.)
ACKDATAREQ
(SELECT)
(AUTO FEED XT’)
HOST BUSY
CONNECTION
GND
GND
PERIPHERAL
LOGIC HIGH”
NO.
Signal
IN
19
STROBE-RET
20
DATA 1 -RET
21
DATA
22
DATA
23
DATA
24
DATA
25
DATA B-RET
26
DATA
27
DATA
OUT
28
ACKNLG-RET
OUT
OUT
BUSY-RET
30
PAPER END-RET
OUT 31
32
33
34
35
36
ERROR
DATA AVAILABLE
GND
NO CONNECTION
SELECT IN’
ND.
IN
OUT
OUT
signals valid in Epson LQ printer control mode.
level is to at register.
is to
at register.
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