Tektronix 2221 - APPENDIX B: RS-232-C DEVICE INTERCONNECTION; DETERMINING DEVICE TYPE and INTERCONNECTION RULES

Appendix B -
2221
Operators
П
П
n
C
APPENDIX B
This
appendix
supplies
some
additional
information
about
connecting and
using
the
RS - 232 - C
Communications
Option .
Printer
/
Plotter
switch
settings for
some
tested
formats and
plotter
types are
shown
for
both
RS -
232 and
GPIB
(
Option 10 ) .
Some
common
questions and
answers
about the
Communications
Options
are
included .
Most of
questions are
about
Option
12 .
RS -
232
- C
DEVICE
INTERCONNECTION
П
1
INTRODUCTION
NOTE
This
information
will
aid you in
determining
the
cabling
needed to
hook
your 2200
Family
oscilloscope
to
other
RS - 232 -
C
devices . The
majority of
interconnection
situa
tions
that
you may
see
are
covered .
You cannot
reliably
determine if a device is
DTE or
DCE by simply looking at the RS - 232 - C connector .
You must verify the device type from the device's
operators
or
service
manuals .
1. To
which "
logical "
type
of
device
are
you
connecting
?
From the equipment manual , find out if the device is
DTE or DCE
.
The RS
- 232 - C
standard
defines the
interconnection
between two types of
devices
.
They are Data
Terminal
Equipment
(
DTE ) and
Data
Communications
Equipment
( DCE ) . A
DTE
device that
conforms to the
standard
has a
male RC -
232
- C
connector
.
Examples
are
terminals ,
com
puters , and printers . Generally , the DTE device is the
source of the
data , but this
is not always
the case . A
DCE
device that
conforms to
the
standard
has a
female
RS - 232 -
C
connector .
An
example of
a
DCE
device is
a modem .
2. Which " physical ” type of connector does the device
have ?
Male is
standard for a DTE
connector
.
Female
is
standard for a DCE
connector .
DETERMINING
DEVICE
TYPE
П
When
interconnecting
your
2200
Family
oscilloscope to
other
RS
- 232 - C
devices you
must
determine the
device
type and
the
connector type .
From that
information
, the
interconnection
cable
you
needed
can
be
determined .
If you
have a DTE
device with a
male
connector or a
DCE
device
with a
female
connector ,
you
may
use a
stan
dard RS - 232
- C "
straight
through
"
interconnection cable . If
the
connections are
not
standard
,
read the
Interconnection
Rules ,
Then
read
the
Interconnection
Cable -
Type
Identification
information to find
the
interconnection
cable
type you
will need
for your
application
.
o
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