EasyManua.ls Logo

IBM 1 Series - Page 111

IBM 1 Series
198 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
Selection
of
the
Optimum
Interface
4-6
GA34-0033
This
section discusses
the
advantages
and
disadvantages
of
using
the
following
interfaces
for
attachment
of
an
OEM
device:
«
Nonisolated
current
loop
interface
e
Isolated
current
loop
interface
e
EKIA-voltage-level
interface
e
TTL-voltage-level
interface
Most
OEM
devices
that
can
be
attached
to
the
teletypewriter
adapter
card
are
manufactured
with
both
a
current
loop
interface
and
an
EIA-voltage-level
interface
as
switch-selectable
options
that
are
included
in
the
basic
price
of
the
device.
Some
devices
are
manufactured
with
(1)
only
the
EIA
interface,
(2)
only
the
current
loop
interface,
or
(3)
one
interface
as
standard
and
the
other
as
an
added
cost
feature.
Current
loop
mode
also
has
more
noise
immunity
than
EIA
or
TTL
voltage
levels.
When
most
OEM
devices
are
ordered
with
an
EIA
interface,
they
contain
the
full
start-stop
feature
subset
of
the
EJA
interface:
e
Transmit
e
Receive
e
Request
to
send
e
Clear
to
send
«
Data
set
ready
«
Data
terminal
ready
e
Carrier
detect
e
Signal
ground

Table of Contents

Related product manuals