LFE 2000 Series - Page 78

4,
For
a
test.
NOTE:
958-31
REV.
B
timer
relay,
use
the
START/STOP
or
START/RESET
key to
initiate the ttmer
The
rneasured
value
should
agree
with
the value
determined
in step 2.
The
event
relay(s)
in
models
segment
at which
they
have
event
relay(s)
to
operate
at
proflle
in
order
to
check
the
2012
and
2013 trigger
at
the
end of the
been
set
in
the TUNE
LOOP.
After
setting the
a
specific
segment,
run
through
a sample
event
relay
operatjon.
7
.2.9
COMMUNICATIONS
TESTING
tinits
which
have
had
a
communications
board
added
by the MoD
CENTER
shotrld
be
tested
to
make
sure
that
the
communications
circuitry
is functional.
In
order
to make these
tests,
]t
is
necessary
for
the
MOD
CENTER
to
have sorne
sort of
ternrinal
such
as a
personal
computer
with
a
RS232
port
and
a
"converter/power
supply"
box
between
the
terrnrnal
and
the
controller.
(0nly
the
non_isolated
RS232
optjon
can be testecl
wrthout
the
converter/power
supply
box.
)
Provrding
the
terrninal
or
personal
computer
is
the
responslbility
of
the MOD
CENTER.
However,
LFE
has
a
Baslc program
on
a 5 1/4"
diskette
that
will
provide
menu drtven
comnands
to
the
PC
RS232 port
for
an
IBM-PC
or
equivalent
machine
using
the MS-DgS
operatlng
systen.
A
listing
of
the
program
ls also
avai.lable
for use orr
non-DoS
machines
with Basic
language
capability provided
that
the
operating
systern
supporrs
both
read
and write
functions
through
the
RS232
port.
The
prog]-am
has beerr
well
commented
to
provide
aid to
the
user
in constructing
a
proBrarn
that will work
on
hrs
machine.
The
"converter/power
supply"
box
is rreeded
to convert
the
RS232 output
fronr
the
terrnrnal
into
the
RS422
or
Current
Loop
inputs
needecl
by
those communjcations
opti-orrs.
It
must
also
contain
the
external
power
supplies
needed
for isolated
communrcations.
If
help
is
needed,
contact
the factory
for
informarron.
Connect
the
coutroller
to
a terminal
through
a converter/power
supply box.
Make
sure
that
the
controller
DIP swltches
have been
set
properly
to
nratch thr:
equipnrent
used
f
or
the
test-
.
(
see
t-he
instal
lation
manual
. )
Usrng
the
installation
manual
for
rnformatlon
on
the cornmunications
fornrat
or',
usirrg
the
special
prograrr
drskett.e,
send
several commands
to
the controller and
observe
the
control
ler
response
to ensure
that the
cunrnitrnicat
rons loop is
performlng
correctly.
-7
1-
LFE
Instruments Drvrsron