Device Description HG G-71912-A | English, Revision 03 | Date: 28.03.2018
13
Commissioning – Chapter 4
After crossing the center of the antenna the
POSI pulse
is triggered. Its duration is termi-
nable. The bits
TRANS_IN_FIELD
and
CODE_OK
are deleted, as soon as the sum voltage
falls below the
Threshold for Decoding
. In this example a reserve from 6 x 8 ms for trigger-
ing the
POSI-Puls
is left. The crossing velocity is approx. 0.87 m/s (140 mm length of anten-
na / 20 x 8 ms).
In the following protocols the impacts of a high interference level can be seen.
Figure 8
Diagram: commissioning protocol / high interference; sum voltage over track
The interference level reaches up to 300 samples. At transponder 207 the noise is due to a
charging station so high, that it even influences the transponder signal. As an impact it takes
9 x 8 ms until the transponder 203 is decoded (see Figure 9 on page 14). This is sufficient
for a slow crossing velocity of 0.5 m/s (140 mm / 33 x 8 ms) to generate a
POSI pulse
, in
contrast a velocity of 1 m/s is to high, this transponder cannot be crossed with such a ve-
locity.
High interferece level
