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Installation / Commissioning
English, Revision 04, Date: 19.01.2015
12
During each Transponder crossing, the sum voltage increases initially. Once the
threshold
Threshold for Decoding
has been exceeded, the bit
TRANS_IN_FIELD
is set. Following 4 x 8 ms (= 4 data points) the Transponder code
is decoded. The duration depends on the setting for
Number of Equal Codes
within
the menu
Time & Code
. In this example, this parameter is = 2, i. e., the newly re-
ceived code is compared to 2 already received codes.
Once the center of the Antenna has been crossed, the
POSI-Puls
is generated. Its
duration is adjustable. The bits
TRANS_IN_FIELD
and
CODE_OK
are deleted, when-
ever the sum voltage decreases under the value for
Threshold for Decoding
. In
the shown example there is spare time of 6 x 8 ms for the generation of the
POSI-
Puls
.
The following protocols show the influences of high interference levels on the Antenna
performance.
Figure 9
Diagram: Commissioning Protocol / high interference level; shown is the
sum voltage over the traveled distance
The interference level reaches up to 300 units. At Transponder 207 the noise is at such
a level that it even influences the Transponder signal. As a result it takes 9 x 8 ms until
the Transponder 207 has been decoded (refer to Figure 10 on page 13). For the slow
crossing speed 9 x 8 ms is still sufficient for generating a
POSI-Puls
, but at high
speed it would no longer be possible to decode this Transponder.
High Interference Level