Arexx BS-510 Mode D'emploi page 39

The module also can be operated in a stand-alone mode (without being
supplied from the USB-connector at a deactivated PC). In this case however,
the BS-510 must be connected to an external power supply (5 up to 7.5 Volts,
minimal 500mA, e.g. a universal mains power adapter).
The module signals its status by one green and one orange LED. The
green LED will shortly flash as soon as the BS-510 receives a message from
a sensor. The orange LED will be activated as soon as data is recorded in the
internal data-flash memory, which also indicates a disconnected PC.
The orange indicator will be switched off as soon as the PC-connection has
been reactivated.
E
Radio
N
Sensor data will be received at the 433MHz (ISM band) radio band. The
G
module has been equipped with an internal antenna for reception of the radio
signals. In order to enable an undisturbed and reliable radio transmission the
L
module must be installed at an optimal location by excluding deteriorating
conditions such as:
I
– metallic walls,
S
– armed concrete, (building) concrete with steel bars, mesh, etc.,
H
– armed glass, e.g. with a metallic mesh or grid
– other equipment operating in the range of a 433MHz radio-band
Radio interference may also cause a display of unknown sensors. Unexpected
sensor data may be suppressed by activating the sensor filter option in the
software.
USB
USB-implementations may vary from PC to PC, which mostly seems to cause
some problems at connecting and disconnecting (respectively switching on
and switching off) the computer. Sometimes even the disconnected PC will
still provide the USB-connector with the standard amount of specified DC-
power. Under such conditions the BS-510 will operate without the need for an
external power supply. In other cases, in which the USB-connector does not
provide DC-power, an external power supply will be needed to allow the BS-
510 to collect measurement data during the offline-periods of the PC.
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