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IBM 5150 Hardware Reference Manual

IBM 5150
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Table
10.
Connector Pin Assignment and Descriptions
of
Interface Signals (cont.)
Signal
Return
Pin
No.
Pin
No.
Signal
Direction
Description
32
ERROR
Out
The
level
of
this
signal
becomes
"LOW"
when
the
printer
is
in-
1.
PAPER
END
state
2.
OFF·LINE
state
3.
Error
state
33
-
GND
-
Same
as
with
Pin
No.
19t030.
34
-
NC
-
Not
used.
35
Pulled
up
to
+5V
through
4.7
Kn
resistance.
36
-
SLCTIN
In
Data
entry
to
the
printer
is
possible
only
when
the
level
of
th
is
signal
is
"LOW".
(Internal
fixing
can
be
carried
out
with
DIP
SW
1-8.
The
condition
at
the
time
of
shipment
is
set"
LOW"
for
this
signal.)
NOTES
1:
"Direction" refers
to
the direction
of
signal
flow
as
viewed
from
the printer.
2:
"Return" denotes
"TWISTED
PAl
R
RETU
RN"
and
is
to
be
connected
at
signal
ground
level.
As
to the
wiring
for the interface,
be
sure to
use
a twisted-pair cable for
each
signal
and
never
fail
to complete connection
on
the
Return
side.
To
prevent
noise
effectively, these
cables
should
be
shielded
and
connected
to
the
chassis
of
the
System
Unit
and
the printer,
respectively_
3:
All
interface conditions
are
based
on
TTL
level.
Both
the
rise
and
fall
times
of
each
signal
must
be
less
than
O.2.us.
4:
Data
transfer
must
not
be
carried out
by
ignoring
the
ACKN
LG
or
BUSY
signal.
(Data
transfer to this printer
can
be
carried out
only
after confirming
the
AC
KN
LG
signal
or
when
the
level
of
the
BUSY
signal
is
"LOW".)
2-76

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IBM 5150 Specifications

General IconGeneral
BrandIBM
Model5150
CategoryDesktop
LanguageEnglish

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