Commissioning
English, Revision 09, Date: 13.12.2016
11
tion 4.2.4 on page 28). For this function Antenna HG G-98820ZA offers the use
of the serial interface (refer to section 4.2.3.1 on page 16) or the CAN bus mes-
sage object 3 (see section Table 9 on page 25). Afterwards adjust the position-
ing thresholds so that a safe positioning is possible but that is not triggered by
side lobes. Figure 6 shows a corresponding driving situation, for readings like
this a reasonable threshold for the decoding and the positioning pulse would be
between 400 and 600 units.
Figure 6
Side lobes during a transponder reading
NOTE!
If during the first driving tests a proper track guidance is not pos-
sible try changing the positioning thresholds accordingly.
The separately adjustable thresholds are explained in chapter 5 on page 29. In order
to explain those thresholds and how to find a proper set-up below the process of a
transponder crossing is described.
Every 2 ms a check is performed whether the sum voltage exceeds the value „Thresh-
old for Decoding“. If that is the case the bit
TRANS_IN_FIELD
is set and the
NOISE
counter is incremented. Every 8 ms it is attempted to read a code. If a code is read the
NOISE
counter is reset and afterwards the code is re-read until the
Number of equal
Codes
is reached. If this is successful the bit
CODE_OK
is set.
As soon as the
NOISE
counter exceeds the threshold
Level to Noise Error
the
bit
RX_NOISE
is set.
The bit
CODE_OK
is held until either the sum voltage falls below the value
Threshold
for Decoding
or the bit
RX_NOISE
is set.
A new transponder code can only be read when the bit
CODE_OK
is reset.
Undisturbed Transponder Decoding
Main field
Side lobes
Transponder Reading
Transponder Number
R
ece
p
tio
n v
o
lt
a
g
e
US
/u
ni
ts
