Device Description HG G-71450/1/3/5-A | English, Revision 02 | Date: 06.06.2019
13
Introduction – Chapter 2
As soon as a transponder is within the reading area of the antenna, it is supplied in
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ductively with energy by the energy coil without contact and then cyclically sends
its code back to the antenna at half the transmission frequency. Otherwise, the tran
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sponder is completely passive and does not require a power supply or battery. Only
one transponder at a time is allowed in the reading area of the antenna.
The transponder code can be reprogrammed via the antenna for compatible read/
write transponders (see Table 3 on page 10).
If several antennas are expected to operate simultaneously, the necessary minimum
distance (see section 2.4 on page 11) must be observed.
For some antenna variants, individual antennas can temporarily be deactivated via
the data interface. This can be used, for example, if the antennas do not necessarily
have to be used at the same time e.g. if one is used to detect transponders in longi
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tudinal direction, while the other is used for transverse drive. Table 2 on page 9
shows which variants support the deactivation.
2.7.2 Scope and Function
The positioning occurs according to the field compensation method. Centrically to
the reading station the resulting field for the transponder is erased, resulting in the
data-free area D, which has a width of 25 to 30 mm at the nominal reading distance
S and in which no telegrams are displayed, see Figure 2 below.
The field strength of the alternating magnetic field decreases with increasing dis
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tance between transponder and reading antenna. The exchange of information is
therefore only possible within the detection areas 1 and 2 (Figure 2). Viewed from
above, the detective areas are limited by the field length L and the field width B, see
Figure 3.
Figure 2
Detection area 1 and 2, data-free area D and nominal reading distance S, side view
transponder antenna
transponder
detection areas
area 1
area 2
track
data-free area
D
