Command Overview - Pepperl+Fuchs IUT-F190-R4-V1 Series Manual

Uhr read/write head for identcontrol

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Manual (70 pages)

Table Of Contents

Table of Contents

IUH-F190-V1-*, IUT-F190-R4-V1*

Operation

The reflections and the resulting spatial inhomogeneity of the field strength depend on the

frequency used. The absolute value of the field strength depends on the transmission power.

Since the tags move in the measurement range of the read/write head, and the environment

can change, it is advisable to repeat the commands at different transmission frequencies and

at varying power. Different transmission frequencies are advisable, since the manufacturing

tolerances and the immediate environment of the tag have an effect on the tag's resonance

frequency.

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

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 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