RTX-868-NB
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User manual
The technical features can change without forecasting. AUR°EL S.p.A doesn’t assume any responsibility of damage due to the improper use of the device.
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AUR°EL S.p.A.
Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY
Tel.: +39.0546.941124 Fax: +39.0546.941660
http://www.aurelwireless.com
- email:
Preliminary 19/03/2019
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4
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8
Operation
At power on the device activates the OUT pin (active high), it performs the initialization and it deactivates
the OUT pin.
After the power on initialization the RTX-868-NB uses the WOR (Wake on Radio) functionality which
enables the radio to periodically wake up from sleep mode and listen for incoming packets. The radio goes
back to sleep mode unless a packet has been detected.
This technique, with 10 seconds wake up time, allows to receive valid RF packets with an average current
consumption of about 10uA.
On the transmitter side it is of course necessary transmit a long packet preamble so that the receiver can
wake up and detect the presence of the packet. This means that the transmitted radio packet is 12 seconds
long.
The device is designed for battery powered, sensors network requiring very low power consumption, in
particular for smoke and fire detection applications.
A typical scenario is a network of radio sensors for residential use, each integrating the RTX-868-NB, a
sensor (e.g. smoke or fire sensor) connected to the ALARM input (pin 3) and an alert notification apparatus
(e.g. warning horn) connected to the OUT pin (pin 17).
When the ALARM input (normally high with 65k ohm pull-up resistor) goes low and stays low at least
20msec the RTX-868-NB considers the alarm activated and then it:
1.
activates the OUT pin (active high) for the local warning;
2.
send the alarm RF radio packet (12 seconds long) : all the other devices of the network (see section
below for network selection) receive the packet and then activate their OUT pin.
In a similar way it is possible to deactivate manually the alarm through the TEST/DISABLE input (pin 6)
typically connected to a push button. If the TEST/DISABLE pin (normally high with 65k ohm pull-up resistor)
goes low and it stays low at least 3 seconds, when it goes back high the device:
1.
deactivates the OUT pin (pin low) for the local warning disable;
2.
send the alarm disable RF radio packet (12 seconds long) : all the other devices of the network receive
the packet and then deactivate their OUT pin.
