Canon MultiPASS C5000 Service Manual page 209

Part 2: Printer
2.10.2 Structure
a)
Centronics uni-directional interface (Compatibility mode)
See
b) Bi-Centronics Interface (Nibble mode)
In Nibble mode, the host computer sends data to the facsimile using the E-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 &bit 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
ACKDATAREQ
13 (SELECT) xflog
14 (AUTO FEED XT')
15
16
17
16 PERIPHERAL
LOGIC HIGH"
2.2 lntehce Specificafions on page I-5.
IN
(STROBE)
HOSTCLK
(DATA 1)
(DATA 2)
(DATA 3)
(DATA 4)
(DATA 5)
(DATA 6)
(DATA 7)
(DATA 8)
OUT
(ACKNLG)
PTRCLK
OUT
OUT
(P.E.)
OUT
HOST BUSY
GND
GND
ND.
NO.
Signal
STROBE-RET
19
20
DATA 1 -RET
21
DATA 2.RET
22
DATA 3-RET
23
DATA 4-RET
24
DATA 5-RET
25
DATA B-RET
26
DATA 7.RET
27
DATA E-RET
28
ACKNLG-RET
BUSY-RET
30
PAPER END-RET
31
ERROR
32
DATA AVAILABLE
33
GND
34
NO CONNECTION
35
36
SELECT IN'
2-12
IN
OUT
OUT