Siemens SIMATIC RF650R Configuration Manual page 62

Configuring with the WBM
7.3 The menu items of the WBM
Algorithm
RSSI Delta
Black List
Sessions
The way in which sessions work is very complex and it is recommended that only trained
users should use them. How they work is described in the "EPCglobal Specification
(http://www.gs1.org)".
62
Description
The effect of this algorithm is that from a number "x" of identified transponders,
only the "strongest" are reported. Transponders will only be reported as "relia-
bly identified" if their RSSI value is at least as high as the RSSI value of the
best identified transponder minus the RSSI Δ value.
This algorithm is used only when taking inventories, for example with the XML
commands "readTagIDs" and "readObservedTagIDs" and in the "presence
mode" with PROFINET.
RSSI Delta The value specifies the maximum RSSI difference of the
transponder compared with the highest RSSI value.
The effect of this algorithm is that transponders that have already been pro-
cessed are hidden. This function is particularly useful at read points at which
only one individual transponder or a few transponders should be identified but
the antenna field is larger than the distance between the neighboring tran-
sponders.
With suitable XML or control commands, these transponders can be included
in the black list and therefore filtered out. For example because these tran-
sponders have already been identified or processed.
Size The value specifies the maximum number of transpond-
ers (EPC-IDs) that can be entered in the black list.
The black list is a circulating buffer with a configurable
size. If all the entries in the black list are occupied, the
next new entry deletes the oldest entry.
SIMATIC RF650R/RF680R/RF685R
Configuration Manual, 03/2018, C79000-G8976-C386-06