--
INTERCONNECTION CABLE-TYPE
IDENTIFICATION
The cable-type designations found
in
Table
B-1
correspond to the interconnection illustrations following the
table. The most
used
interconnections
seen
with different
RS-232-C printers are covered.
In
the table, the
information
in
column 1 (Type of Interconnection)
is
inter-
preted
as
follows: DTE/male to DCE/female means a
DTE
type device with a male RS-232-C connector connected to
a
DCE
type device that
has
a female RS-232-C connector
(a
standard RS-232-C male-to-female interconnection).
RS-232-C INTERCONNECTION
CABLE-TYPE ILLUSTRATIONS
The cable-wiring illustrations of B-2 through B-7
correspond to the Cable-Type designations of Table B-1.
They are divided into the straight through (Type
A)
Appendix
B-2230
Operators
interconnections
and
the null modem (Type
B)
interconnections. Both the straight through
and
the null
modem interconnections will also require gender changers
when making male-to-male or female-to-female equipment
hookups.
In
summary, the basic cable types are:
1.
Standard or "straight through" cables with a male
connector
on
one
end
and
a female connector
on
the other.
2.
Null
modem cables that may
be
customized to make
the necessary connector matings. These come
as
male-
to-female, female-to-female,
and
male-to-male.
3.
Gender changers are straight-through cables with
either male connectors or female connectors on both ends.
Table
B-1
Cable-Type Identification
Type of
Interconnection
DTE/male to DCE/female
DTE/female to DCE/male
DTE/female to DCE/female
DTE/male to DCE/male
DTE/male
to
DTE/male
DCE/male to DCE/male
DTE/female to DTE/male
DCE/male to DCE/female
DTE/female to DTE/female
DCE/female to DCE/female
Cable-Type
Designator
A
A1
A2
B
81
82
Application
Straight-Through Cables
Use a straight through cable terminated
on
one
end
with a male connector
and
on
the other
end
with a female connector. This
is
the "standard" cable
connection
in
our discussion.
Use
a male-to-male gender changer
and
a standard cable.
Use
a female-to-female gender changer
and
a standard cable.
Null-Modem Cables
Use
a
null
modem cable terminated with female connectors. This
is
the
"standard null modem"
in
our discussion.
Use
a standard null modem with a male-to-male gender changer or
use
a
male-to-female
null
modem.
Use
two male-to-male gender changers
and
a standard null modem cable
or
use
a male-to-male null modem.
B-3
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