User Manual

Kapsch TrafficCom AG
Page 42 of 58 Installation Manual | SRU-8100 RFID Reader 18000-63
Doc No. 47000001169 | Version 01 | 2014-11-03 | released
47000001169-Ins-01
The row "number of unique tags" specifies how many different tags were read.
When the amount of tags is very high (> 200) the detection of the tags can be speeded up by omitting a
newly initiated "Select” command (see EPC global standard).
This can be tested by selecting Expert settings directly in read mode. If the read operation box is ticked with
TransmitSelectIfNoFilterIsOn a "Select" command is sent in each Inventory. This means that all the tags
that are identified at this time in the field will be reset. It can also happen that tags that have been read are
sometimes reset and re-identified again. In order to capture only new tags, a renewed "Select" can be
prevented. This tick box is cleared on TransmitSelectIfNoFilterIsOn and thus all tags defined only once
read. This selection result is that no time is lost due to a re-read. Please note, however, that tags in which
the read operation was interrupted cannot be retrieved! Thus, it may be that not 100% of the tags are read.
Therefore, this parameter should be used with care in order to achieve top results.
Synchronous mode:
This mode is intended for applications when the requirements for timing are not critical. This mode allows the
device to switch the carrier off during the idle times, thus saving power.
The inventory of the tags (the read process) is performed across all the antennas that are configured. Once
all tags in the field have been read on the last antenna, data are sent to the host PC. The inventory of the
tags is then automatically retriggered by the PC.
The Break after reading option specifies how many milliseconds to pause between two inventory
processes. During this waiting time the carrier can be deactivated. See reference [2] „Configurational
manual” for more information about how to perform this.
In order to keep the time between inventories as short as possible in synchronous mode, data transmission
between the inventories can be omitted. That means that the reader caches all the tags that it finds in the
field in its internal RAM. After a configurable time this tag list is sent to the host PC. This time is given in
milliseconds by the Bulk read parameter.
The current reading performance is displayed under the item Tags per second.
Asynchronous mode:
This mode is intended for applications for which maximum performance is required.
The reader starts the inventory as quickly as possible, and at the end of an inventory it does not deliver every
tag that was read to the PC, but only those that had newly appeared in the field or left it. This allows the time
required for communication with the host PC to be minimized.
The timing of when a tag was reliably read in the field and when the tag no longer appears in the field can be
defined more precisely using parameters. Details of these ObservedThresholdCnt and
ObservedTimeoutCnt parameters can be found in section [2] Configuration Manual.