NuPower Xtender™ 12B04A User Manual
Rev 3.2
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.
