User's Manual
Document # E.0015.16.06 396251
2 Passive Infrared Detector
2.1 Description
The PIR detector unit consists of a PIR sensor and circuitry, an RF transceiver, a micro-
controller, a non-volatile memory, a power supply, a tamper switch, a test switch and a 3V
Lithium HNO
2
battery type 123.
The sensor unit is composed of the following principal parts:
• Mounting plate.
• Sensor PCB assembly with RF controller PCB, LED and battery.
• Inner cover.
• Outer cover with IR motion lens.
An exploded view of the PIR sensor unit is shown in Figure 1 below.
To reduce false alarms, the PIR is pet-immune and has a selectable alarm threshold (1, 2
or 3 movements in the protected space). Once an alarm has been transmitted, the PIR
shuts down for a minimum of 2 minutes. After 2 minutes, the PIR will automatically be
rearmed, provided that movement within the protected space has ceased and not
resumed.
Depending on the space to be protected, the PIR has either a wide-angle lens, with a 70°
viewing angle and a maximum range of 15 m, or a long-range lens, with a 9° viewing angle
and a maximum range of 21 m. (The standard lens supplied is the wide-angle lens.) A
diagram of the lens coverage appears in Figure 2 below.
2.2 Technical Specifications
Operating frequency band – ISM 902-928 MHz.
Mode of operation – frequency hopping; every data packet is transmitted on a different
pseudo random selected frequency.
Data packet transmission duration – less than 7 milliseconds.
Data packet validity check – CRC.
Transmission and reception verification – two-way communication; each received packet is
acknowledged, with an automatic repeat request (ARQ) in case of unacknowledged data
packet.
IR detector sensitivity – ∆ 1.6 deg. @ 0.6 m/sec.
Movement speed range – 0.3 to 1.5 m/sec.
Detection field of view @ maximum range with WA lens – 21 m @ 15 m range *.
Detection field of view @ maximum range with LR lens – 3.5 m @ 21 m range *.
Events reported – movement in room, tamper.
Automatic self-test (transmission of a data packet and receipt of acknowledgment).
Power source – 3V Lithium MNO
2
battery type 123.