PIR-045
PASSIVE INFRARED DETECTOR
2800-00006 Page 8 of 10
Annex 2:
Two Way Communication RS 485
Introduction
The PIR-045 is equipped with a 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 (see
also annex 3).
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 ID’s and the data link is properly terminated. If in doubt consult the manufacturer.
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IF 485A
Temporary Connection for Installation and Configuration
For this, the use of the interface module PIR-IF485A is recommended (see section 12. above). The test socket carries V+,
GND and the two RS 485 ports A and B. The detector needs to be opened for access to the test socket and closed again after
the adjustments. All the adjustments and display functions as detailed in annex 3 are possible without further equipment.
Installation and Configuration for Permanent Wiring
For permanent connection of the RS 485 communication link to a control room the two RS 485 ports A and B are also
accessible on the terminal block. The connector board contains all components required for protection of the communication
link.
In this mode it is not only possible to do all adjustments and signal monitoring remotely from the control room but also
eventually to use the RS 485 link for alarm signalling.
When planning to use the PIR-045 in this configuration please consult the manufacturer for details about the protocol
definitions.
