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14 External Sensitivity Adjustment via RS 485 Data Bus
If the
DIP - Switches 1 and 2
are both set to
„on“
, the detection performance can be adjusted via the RS 485 two
way communication port. Range sensitivity of the model PIR-100 can be set to values between 60 m and
maximum, and model PIR-100H to values between 75 m and maximum. In addition to this, the overall sensitivity
can be fine adjusted by using the software sensitivity button.
The external sensitivity adjustment may also be used if overall sensitivity has to be changed at certain periods of
the day or year depending on the prevailing thermal contrasts. Field tests in the actual environment will determine
the optimum settings.
15 Signal Processing
The sophisticated signal processing ensures an optimum performance and reliability of the detector.
The background noise is sampled and averaged over a large number of cycles giving a noise dependent value for
the alarm threshold and to start the adaptive signal shape analysis whenever a certain amplitude value is
exceeded. If the threshold has temporarily been increased by high background noise or repeated movements in the
field of view, the exponential decay of the threshold level to its original value will take app. 1 … 2 minutes from the
end of the event.
Once the threshold level value has been exceeded, the microprocessor starts its signal shape analysis routine
where a number of interdependent parameters are calculated and analysed.
Only if a signal meets all the predetermined criteria an alarm will be generated.
16 Accessories
16.1 Interface Module PIRIF 485/2 and Installation Software
The Installation Software is very useful for alignment and signal check during setting up and routine maintenance. It
will indicate the amplitudes generated by wanted as well as unwanted targets and help setting the gain control
correctly during walk tests and also show the magnitude of disturbance signals. The installation software is to be
installed on a PC; an interface module is required to convert RS 232/USB to RS 485. The information for
installation and signal monitoring is displayed on the screen of the PC.
If more than one detector is connected to the same RS 485 communication bus, each detector needs to have a
different address (ID).
Please see the PIRIF-485/2 Installation and Setup Manual, for further details.
16.2 Pole Mount Hardware ZA P-L1
Pole mounting bracket with two strap bands for poles of 4 – 16 cm diameter
