19/09/18
Page 59 of 67
ASR650 Operational Manual
4.10.2 Wireless Sync. Level
How does wireless Sync. work?
During the HDX listening period, the ASR is able to evaluate the so called RSSI level. RSSI
means:
R
eceived
S
ignal
S
trength
I
ndication. You might already know this term from other radio
technologies like WLAN. If another reader is activating its RF-field during the HDX listening period
of the reader we are currently looking at, the ASR650
will take this ‘rising edge’ in the RSSI as
the reason, also to activate its own RF-field immediately.
Although the integrated diagnosis function is not explained in detail in this manual, we will have a
look at some RSSI samples. If necessary, please refer to the Integrated Diagnosis Function
manual first.
In a
‘noise-free’ environment, the RSSI should be 1 Volt or lower like in the screenshot above.
The following sample shows the rising edge in the RSSI, caused by another stationary reader that
just activated its field.
At this time the own RF-field is switched off.
This is the start of the HDX listening period.
Sync. Level
needs to be
set
