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82.
PARALLEL INTERFACE SIGNALS
All standard Centronics printers are supplied with an Amphenol
~57-
40360, 36-pin interface connector (Centronics #31310019). The pin assignmer.ts,
na~e,
source and description for each interface signal are listed below.
Parallel
Interface
Connector
Pin
I,
19*
2, 20
3, 21
4, 22
5,
23
6, 24
7, 25
8,
26
9,
27
IG,
28
II,
29
12
13
14
15
Signal
Name
DATA STROBE
DATA
1
DATA 2
DATA 3
DATA 4
DATA
5
DATA 6
DATA 7
DATA
8
BUSY
PE
SLCT
!ov
CSCXT
Source
Input Device
Input Device
Input Device
Input Device
Input Device
Input Device
Input Device
Input Device
Input Device
Printer
Printer
Pri
r.
t£'r
Printer
Printer
Printer
16
~V
17
18
31, 30
32
34
35
36
Chassis Gnd
+5V
INpUT PRIME
Input Device
~
Printer
Line Count
Pill
c;e>
line Count
Pulse Return
Not Used
Description
A 1.0 usec pulse (min.) used to
clock data from the processor to
the printer logic.
Input data levels.
A
high represents
a binary ONE, a low represents a ZERO.
All printable characters (i.e., codes
having a ONE in DATA
6
or DATA
7)
are
stored in the printer buffer. Control
characters (i.e., codes having a ZERO
in both DATA 6 and DATA 7), are used
to specify special control functions.
These codes ?ore net stored in the
buffer except when they specify a
print command and are preceded by at
least one printable character in that
line.
Acknowledge pulse indicates the input
of a character into memory or the end
of a functional operation.
A level indicating that the printer
cannot receive data.
A level indicating that the printer
is out of paper.
A level indicating that the printer
is selected.
(Formerly
SS
signal
old~r
version)
A 10C KHz (Models 101, lOlA. 102A. lOIS)
or 100-200 KHz
(All other models)
A level which causes the printer to
be pril'led.
(Not in 101)
A level that indicates a paper empty.
light detect. or a deselect condition.
(Not in 101)
Both sides of the line count switch
appear at the interface connector.
This switch is opened and closed
during each line feed operation. A
level delivered to the switch would
be pulsed off and on each time a line
feed operation is performed.
(Series 300 and 500)
(Series 300 Gild 500)
·Second pin number indicates twisted pair return (tOV).
**Active low signals are specified by a line over the signal name. Active high
signals have no line.
8-3
Rev. E
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