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™ Standards
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standards
have been developed to define the connection b/w the DTE and a
DCE
o Though
the solution differ,
each standard provides
a model for
mechanical,
electrical
and functional characteristics of the connection
o Electronic Industries Organization (EIA)
and ITU-T
™ EIA 232 Interface
o Standard developed by EIA
o Defines
Mechanical, Electrical and
Functional characteristics of
the interface
b/w
DTE and a DCE
o Originally issued in 1962 as the RS 232
standard
o Revised several times, recent version EIA
232-D
o Defines not only the type of connectors
to be used but also the specific cable
and
plugs and the functionality of each pin
Mechanical Specifications
o EIA
232 standard defines
interface as a
25-wire cable with
a male and
a
female
DB 25 pin connector attached to either end.
o The length of the cable may not exceed 15
meters(50 feet)
o A DB 25 connector is a plug with 25 pin or receptacles each of which is
attached
to a single wire with a specific function
o With this design, EIA has created the
possibility of 25 separate interactions
b/w
a DTE and a DCE
o Fewer
are actually used
but standard allows
for future inclusion
of
functions
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