Siemens SIMATIC RF650R Configuration Manual page 48

Configuring with the WBM
6.3 The menu items of the WBM
Table 6- 6
Parameter
Description
Radiated power
Gain
Cable loss
Apply parameters to
all antennas
Effective
radiated power
RSSI threshold
48
Description of the antenna parameters
Description
Input box for storing device-specific information.
For example, the location of the antenna
Basic radiated power that the antenna outputs.
Note: The unit (ERP/EIRP) depends on the selected radio profile.
The two input boxes are linked together. If the value in one of the input boxes
is changed, the value of the other input box will be adapted automatically. The
actual radiated power emitted may be lower due to other components and/or
parameters.
Value range
Increment
The antenna gain affects the actual radiated power.
The gain of an antenna describes how much of the power fed in can be con-
verted in the air and depends on the antenna being used. Here, you can either
select an antenna based on its name or enter the value of the antenna gain of
an antenna being used directly.
Value range
Increment
The cable loss affects the actual radiated power.
The cable loss depends on the cable being used. Here, you can either select a
cable based on its name or enter the value of the cable loss of a cable being
used directly.
Value range
Increment
Button that transfers the entered values (radiated power, gain, cable loss) of
this antenna to all other antennas.
The actual radiated power is made up of the transmit power emitted by the
reader, the cable loss and the antenna gain. It is possible that the target value
for the radiated power is never reached in reality due to the use of long cables
and antennas with low gain.
Note: The unit (ERP/EIRP) depends on the selected radio profile.
The RSSI threshold specifies the signal strength above which a transponder is
identified. Only the transponders that reach the RSSI threshold are entered in
the list of identified transponders.
In reflecting environments (metal reflects UHF waves), transponders could be
detected that are not located directly in the antenna field and therefore should
not actually be "read". The RSSI value of these transponders is usually no-
ticeably lower than the RSSI value of transponders located directly in antenna
field. Such transponders can be filtered out with a suitable RSSI threshold
value.
In the "Diagnostics - Tag monitor" menu item, all the detected transponders
are displayed along with their RSSI values. From the RSSI values of the tran-
sponders that should be read and the RSSI values of the transponders that
should not be read, it is possible to derive an RSSI threshold value.
Value range
Increment
5 ... 33/36 dBm
0.25 dBm
-15 ... 15 dBi
0.25 dBi
0 ... 63.75 dB
0.25 dB
0 ... 255
1
SIMATIC RF650R/RF680R/RF685R
Configuration Manual, 10/2015, C79000-G8976-C386-03
3 ... 2000/4000 mW
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