Page 11 (12)
www.ernitec.com
20 Appendix
Two Way Communication RS 485
20.1 Introduction
The PIR is equipped with an RS 485 interface for two-way communication between the detector and a PC or other
control device. This communication link is used for detector set-up and remote adjustments as well as for signal
monitoring.
It can either be used temporarily for installation or permanently wired for remote access to the detector from the
control room. RS 485 can accommodate up to 32 detectors on the same data bus with a maximum bus length of
1’000 m – provided the detectors have all different IDs and the data bus is properly terminated at both ends. There
is no terminating resistor built into the detector.
The last detector on the bus
, on the opposite side of the IF 485B
interface module, needs a
terminating resistor of 120
Ω
. This can be accomplished by adding a resistor between
the
wires RS 485 A
and
RS 485 B
.
Please see the PIRIF-485/2 Installation and Setup Manual, for further details.
21 Appendix
Installation Software
21.1 Introduction
The installation software is available as accessory for alignment, setting up and fault finding. It can be used for
remote programming
and
verification
of all detectors connected to the same RS 485 data bus and is
recommended for verification of all installations in order to optimise the performance of the detectors. If more than
one detector is operated over the same communication link it is necessary that the detectors have different
addresses (IDs).
For operation with a standard PC a converter to RS 485 is required. The interface box is available as accessory.
21.1.1 Application of the Installation Software
The installation software is a most useful tool for remote programming and for checking the alignment of the
detectors. It greatly facilitates the optimisation of an installation to suit a particular site.
Independently of the position of DIP-Switches 1 and 2 (hardware or software settings) the program is capable to
display the actual parameter settings as well as the analog signals of the selected detector.
For
remote programming
purposes the
DIP-Switches 1 and 2
have to be switched to
on-on
position (software
settings). Now all parameter settings can be altered with the software.
The software is particularly helpful in situations where a detector is operated under conditions near the
recommended operating limits of height, detection range and target speeds. The information supplied by the PC
display should be used to monitor the detection performance of the detector and make adjustments if required.
Depending on the site’s animal activity, vegetation moving in the wind and/or other sources of disturbance it is
possible that unwanted alarms occur. Monitoring and interpreting the information supplied by the installation
software will help finding the best solution either by adjusting the alignment and/or settings of the detector or by
removing disturbance sources from within the field of view.
Please see the PIRIF-485/2 Installation and Setup Manual, for further details.
120R
A B
120R
A B
