Operating Manual HG G-98830YA | English, Revision 02 | Date: 21.06.2021
80
Chapter 14 – Troubleshooting
As soon as the
NOISE
counter exceeds the
Level to Noise Error
limit, the
RX_NOISE
bit is set. This means that noise signals hinder the decoding of
codes.
The
CODE_OK
bit is held until either the reference voltage falls below the
Threshold for Decoding
or the
RX_NOISE
bit is set.
A new transponder code can only be read again when the
CODE_OK
bit has
been reset.
This means, for example, that in the event of strong interference voltages in the 64
kHz range, the antenna will not read in a new transponder for 2 ms x
Level to Noise
Error
even after the transponder has left the reception range. If another transponder
enters the reception range during this time, the
NOISE
counter is automatically re
-
set, but the previously stored code is retained.
14.2.3 Setting Positioning Thresholds
Requirements:
For the exact setting of the positioning thresholds, you must comply with the follow
-
ing conditions.
It must be possible to drive the vehicle on the installation or on a test installa
-
tion that is as similar as possible.
The vehicle must be positioned at the nominal reading distance above an
installed transponder.
For an entire driving course, you must log a complete drive over the facility.
For setting the positioning thresholds you can use the serial interface of the antenna
(see 9.2 „Serial Interface (RS232)“ on page 35) or the CAN-Bus Message Object 3
(see Table 18 on page 43) . Using CANopen® you can adjust the parameters under
Index 2000.
The following questions will help you set the positioning thresholds:
What signal strength does not yet trigger the detection of a transponder?
At what point is a transponder read?
To set the positioning thresholds and to detect interferences, proceed as follows:
Connect the serial interface of the transponder antenna to a PC as described in
chapter 9 „Interfaces“ on page 35 and start a monitor program on the PC to
establish a connection with the antenna software.
Place a transponder under the antenna.
In the status line of the monitor program, the voltage S must increase
significantly. The code must be recognized immediately and the number of
readings must count up steadily to 255.
Remove the transponder from under the antenna.
If there is no transponder in the field, the voltage S must drop to very small
values. The code display and any display of the number of readings remain. If
this is not the case, interference is induced in the frequency range of 64 kHz. In
some cases the critical frequency range can be bypassed by changing the
sideband (see 10.2.7 „(F)requency & Antenna Tuning“ on page 60).
