SERIAL
COMMUNICA
TIONS
EXAMPLE
-33-
PROCESS
CONTROLLING
SYSTEM
Six
M
odel
IMRs
w
ith
Serial
Com
m
unication
O
ption
are
used
to
m
onitor
and
contr
o
l
the
tem
p
er
atur
e
o
f
6
ovens
at
a
large
b
akery.
The
IMRs
are
located
at
each
of
the
o
vens
in
the
p
roduction
ar
ea
o
f
the
building.
T
h
e
com
m
unications
lines
ar
e
run
to
an
industr
ial
c
om
puter
located
in
the
pr
oduction
o
ffices.
T
h
e
d
ra
wing
below
shows
the
Cur
re
nt
L
oop
set-
up.
E
ach
IMR
is
g
iven
an
address
and
program
m
ed
accordingly
(P
rogram
Module
#7)
.
A
baud
ra
te
of
1200
is
selected.
An
application
p
rogram
is
written,
which
sends
and
retriev
es
d
ata
fro
m
th
e
IMRs.
Note:
O
n
all
IM
indicators,
the
SO+
and
the
+20
mA
SRC
are
connected
internally.
Therefore
it
is
not
necessary
to
have
this
terminal
tied
to
any
other
terminal
on
the
unit
if
that
unit
is
serving
as
the
loop
supply
source.