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IUH-F190-V1-*
Operation
Read Algorithm
To communicate with tags with the maximum possible probability, the read/write head uses an
algorithm that varies the transmitting power and frequency. You can set the corresponding
values for this algorithm via the parameters Power Transmit (PT), Channel Frequency (CD), or
Number of Channels (NC) for the frequency hopping spread spectrum, and Number of
Attempts (TA). The number of set attempts is executed for each pairing of power and
frequency. This process takes a long time, but leads to a high read/write rate. The algorithm
runs through all combinations because it may be the case that a tag can be detected only by
one specific combination of power and frequency. This applies when the read/write head uses
a programmable frequency list as the frequency access method. This frequency list is defined
by parameter CD.
If the country identifier (RC) specifies a frequency hopping spread spectrum, the channels
defined there are used. This is not influenced by the programmable frequency list. You can
adjust the number of channels used for each attempt via the Number of Channels parameter
(NC).
With the parameter Search Algorithm Cancellation Criteria (NT), you can specify the number of
tags to be processed. If you know the number of tags in the measurement range, you can use
this total number as the value for parameter NT. If the number of tags found corresponds to or
exceeds the value defined in parameter NT, the algorithm cancels any further runs to save time.
Tip
If analysis of a specific application shows that a particular frequency and transmission power
are sufficient to execute commands successfully, the parameters can be set accordingly,
subject to national legislation. This measure reduces the processing time.
7.3
Command Overview
The commands in the list are described in detail on the following pages.
Read/Write Commands
Abbreviation Command description
SF
EF
SS
ES
SP
SR, #SR
ER, #ER
SW, #SW
EW, #EW
KI
Filter Commands
Abbreviation Command description
FI
MF
See "Single Read Read-Only Code SF" on page 40
See "Enhanced Read Read-Only Code EF" on page 40
See "Single Read Special Read-Only Code SS" on page 40
See "Enhanced Read Special Read-Only Code ES" on page 41
See "Single Write Special Read-Only Code SP" on page 41
See "Single Read Words SR" on page 42
See "Enhanced Read Words ER" on page 42
See "Single Write Words SW" on page 43
See "Enhanced Write Words EW" on page 43
See "Kill UHF Tag KI" on page 44
See "Set Filter Mask FI" on page 44
See "Activate/Deactivate Filter MF" on page 46
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