21
Q
Can
I
use
the
USB
port
to
configure
ZXT
‐
120?
A
No,
the
mini
USB
port
only
provides
an
alternative
option
for
user
to
power
the
ZXT
‐
120.
Q
Do
I
need
an
electrician
to
install
Z
‐
Wave
products
in
my
house?
A
Installation
can
be
simple.
In
some
cases
all
you
need
to
do
is
mount
the
ZXT
‐
120
to
a
wall
or
wooden
racks.
You
also
can
place
the
ZXT
‐
120
on
the
desk
and
power
it
with
dry
cell
batteries.
Q
How
to
select
my
air
‐
conditioner
IR
code
from
ZXT
‐
120?
A
You
should
refer
to
the
code
list
and
look
into
the
brand
and
try
the
code
no.
sequentially
until
you
find
the
right
code.
You
can
record
down
your
device
code
under
the
table
for
future
reference
after
setting
up
the
ZXT
‐
120
correctly.
Q
ZXT
‐
120
is
working
on
top
and
4
‐
directions
IR
output,
but
there
is
no
response
on
the
IR
emitter
socket,
why?
A
ZXT
‐
120
supports
two
IR
power
levels
for
the
external
IR
emitter
to
avoid
saturation
of
the
IR
receiver.
You
can
set
the
IR
output
power
level
by
the
Parameter
Table
value
(normal
or
high
power
mode)
or
adjust
the
position
of
your
external
IR
emitter.
Q
Can
I
use
2
or
more
ZXT
‐
120
in
my
house?
What
is
the
max.
units
if
yes?
A
Yes
and
it
is
very
depend
on
the
capability
of
gateway
/
controller.
For
example,
gateway
can
supports
up
to
8,
16
or
32
ZXT
‐
120
in
a
network.
Q
How
to
avoid
the
IR
interference
if
I
am
using
2
identical
air
‐
conditioners
in
same
location
but
want
to
control
them
individually?
A
User
can
disable
the
Surround
IR
Output
function,
connect
the
external
IR
emitter
and
aim
it
at
the
specific
AC
unit.
The
operating
distance
of
external
IR
emitter
is
around
100cm
(High
power
mode)
and
50cm
(Low
power
mode)
but
it
is
also
depends
on
the
sensitivity
of
the
IR
receiver.
External
IR
emitter
cable
