Installation
22
Marathon
Series
FA/FR
2.
Install
all
electronics
wiring
according
to
the
applicable
sections
5.4
,
5.7.x
,
and
5.8
!
3.
Plug
the
RS485/RS232
interface
converter
into
your
computer’s
serial
port,
or
attach
it
to
a
serial
cable
connected
to
the
computer!
Use
9
pin
to
25
pin
converter
if
necessary!
4.
If
the
9
VDC
power
supply
is
used,
apply
power
to
the
RS485/RS232
converter!
5.
Apply
power
to
the
FA/FR
sensor!
6.
Turn
on
your
computer!
You
need
to
make
sure
another
serial
device
(e.g.
an
internal
modem)
is
not
using
the
identical
COM
‐
port
at
the
same
time!
Always
make
all
electrical
connections
before
applying
power
to
the
FA/FR
sensor!
Do
not
change
RS485
or
power
connections
on
the
RS485/RS232
converter
while
the
FA/FR
sensor
has
power
applied,
as
this
may
cause
damage
to
the
Interface
converter!
5.7.1
Multidrop
Installation
(4
‐
Wire)
In
4
‐
wire
multidrop
installations
the
data
can
be
transferred
in
both
directions,
from
sensor
to
PC
and
reverse.
Figure
18:
Wiring
for
4
‐
Wire
Sensor
Setup
5.7.2
Multidrop
Installation
(2
‐
Wire)
Using
the
2
‐
wire
installation
saves
2
wires
in
comparison
to
the
4
‐
wire
installation.
The
disadvantage
is,
that
the
data
transfer
can
be
only
in
one
direction
at
the
same
time.
To Computer
RS232 serial port
RS232/485
Interface Converter
XXX485CVT…
Electronics Housing
9 VDC power supply or ...
24 VDC power supply
from RxB
from RxA
from TxB
from TxA
Ground
+24 VDC (optional)