LRS-455-EU Data Transceiver Users Manual
LUM0032AA Rev A
Version 1.0
16
Setting Description
0
Lowpower, disabled
1
LEDs dimmed, transceiver remains awake, transceiver is listening to the
Master’s transmissions on every slot, and transceiver’s data port is shut
down if the RTS line is deasserted (low). In this case, the transceiver
needs to be awakened before it will be able to send data to the Master.
2
LEDs dimmed, transceiver sleeps every other slot
3
LEDs dimmed, transceiver sleeps 2 of 3 slots
4-31
LEDs dimmed, transceiver sleeps the number of slots corresponding to
the setting. For example, with a setting of 31 the transceiver sleeps 30 of
31 slots.
I
MPORTANT
N
OTES
1.
Lowpower Mode is used only in MultiPoint Slaves using serial protocol. Power savings occur only
when the Slave is linked. There are no power savings when the Slave is transmitting data.
Lowpower Mode is of little value when a Slave has a constant, high throughput. MCUSpeed must
be set to ‘0’ and RF Data Rate must be set to ‘3’ for Lowpower Mode to operate properly.
2.
To communicate to an RS232 port of a transceiver that is in Lowpower Mode, the RTS line must
be held high to wake it up. The transceiver will wake up within approximately 20 milliseconds of
when RTS goes high.
3.
If the RTS line on the Slave is held high, the transceiver will remain in normal operation
regardless of the Lowpower Mode setting. Once RTS is dropped the transceiver reverts to the
Lowpower Mode.
If the transceiver has the DTRConnect option set to 1 or 2 and if the Lowpower Mode enabled (set to 1-
31), the RTS line on the transceiver must be asserted for the ‘DTRConnect’ feature to operate properly.
(A)
H
IGH
N
OISE
The High Noise Option is useful in determining if out of band interference is affecting a radio link. A
setting of 1 will provide a reduction of gain in the front end circuit thereby decreasing the affect of any out
of band noise. The results will be seen as a lower signal value and a much lower noise value (as found in
Radio Statistics or Diagnostics). If the noise is not reduced by a greater amount than the signal, the
interference is most likely an in band issue.
When a noise problem is shown to be helped by way of the High Noise option, chances are that the noise
may be further squelched by use of a band pass filter available for sale from FreeWave Technologies.
(C)
R
EMOTE
LED
This setting enables the user to connect Remote LEDs through the diagnostics port.
Setting
Description
Notes
0
Board LEDs
Default. Only on board LEDs are enabled.
1
Board and Remote LEDs
Onboard LEDs are enabled as well as
Remote LEDs through the Diagnostic port.
2
Remote LEDs
On board LEDs are disabled. Remote LEDs
are enabled through the Diagnostic port.
Note
: When using Remote LEDs the center (TX) LED will not turn Green when in Setup mode. This line is
not pinned out.
Current Draw
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