NuPower
Xtender™
12B04A
‐
D27
User
Manual
Rev
1.0
8
4.2
DC POWER
The
nominal
supply
voltage
for
the
NuPower
Xtender
is
+28
VDC.
The
amplifier
module
is
able
to
support
operation
over
a
supply
voltage
range
of
+11
to
+32
VDC
with
minimal
performance
degradation.
4.3
GROUND
The
signal
and
power
grounds
are
tied
together
in
the
amplifier
module.
4.4
RS
‐
485 SERIAL COMMUNICATIONS
These
signals
are
for
the
RS
‐
485
serial
communications
with
the
NuPower
Xtender.
This
interface
is
described
in
Section
5.
4.5
TRANSMIT/RECEIVE (T/R) SOURCE OR SINK
The
T/R
Source
or
Sink
line
is
configurable
as
either
an
output
(source)
or
an
input
(sink).
When
the
T/R
line
is
configured
in
source
mode,
the
Xtender
transmit
and
receive
switching
occurs
automatically,
based
on
the
T/R
level
setting
and
the
transceiver’s
transmit
state.
The
Xtender
sources
a
logic
signal
to
indicate
the
mode
(transmit
or
receive)
of
the
BDA.
A
logic
high
indicates
the
Xtender
is
in
transmit
mode,
while
a
logic
low
indicates
the
Xtender
is
in
receive
mode.
When
the
T/R
line
is
configured
in
sink
mode,
the
transmit
and
receive
switching
is
under
manual
control.
Applying
a
logic
high
to
the
T/R
line
places
the
Xtender
in
transmit
mode.
Likewise,
applying
a
logic
low
to
the
T/R
line
places
the
Xtender
in
receive
mode.
T/R
line
levels
can
be
configured
to
+3.3
VDC
or
+5
VDC
logic
levels.
This
I/O
line
is
described
in
Section
5.
