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IUH-F190-V1-*, IUT-F190-R4-V1*
Operation
Several Tags in the Measurement Range
Each read or write command can access one, several, or all tags in a measurement range. The
process is controlled by filter masks, which are managed via the commands Set Filter Mask
(FI) and Activate/Deactivate Filter (MF). These commands allow you to detect specific tags in
the measurement range. see chapter 6.5.
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 val-
ues 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 fre-
quency. 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 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.
6.3
Command Overview
The commands in the list are described in detail on the following pages.
The following uses the command syntax for the IUH-F190-V1-* read/write heads with IDENT-
Control serial control interface. The channel number <ChanNo> is always included in the com-
mands. The command syntax is identical to the syntax of the IUT-F190-R4-V1-* read/write
heads with integrated RS-485 interface, except for the channel number. For the IUT-F190-R4-
V1-* read/write heads, the channel number <ChanNo> is not included in single-drop mode. In
multi-drop mode, the channel number <ChanNo> is replaced by the device address <Devi-
ceNo>. See chapter 6.7.
Read/Write Commands
Abbrevia-
tion
SF
EF
SS
ES
SP
SR, #SR
ER, #ER
SW, #SW
40
Command description
See "Single Read Read-Only Code SF" on page 41
See "Enhanced Read Read-Only Code EF" on page 41
See "Single Read Special Read-Only Code SS" on page 42
See "Enhanced Read Special Read-Only Code ES" on page 42
See "Single Write Special Read-Only Code SP" on page 42
See "Single Read Words SR" on page 43
See "Enhanced Read Words ER" on page 44
See "Single Write Words SW" on page 44
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