Function
21
Building Technologies
009865_b_en_--.doc
Fire Safety & Security Systems
11.2007
5.5.3 Radio
transmission
The radio module SPU60xx consists of a p.c.b. with an integrated antenna.
The radio module is a component which makes a bi-directional data transmission
possible in a frequency range of 868-870 MHz.
The radio module has a complete emitting and receiving unit as well as a
microcontroller control for all radio transmission functions.
The radio transmission is in the SRD band (Short Range Device), which is a
special frequency band with defined usage rules. The SRD is free from amateur
radio activities. This band provides 80 channels with a channel width of 25 kHz.
Properties of the SRD band:
z
defined, low maximum transmission performance and duty cycle (emitting/idle
period relation)
z
Sub-bands for different applications
z
High availability
Properties of the radio module:
z
The radio transmission realizes the highest detection capability
z
4 alternative channels are assigned to each of the 16 basis channels
(5 x 16 = 80 different channels)
–
Any disturbance of the basis channel is immediately realized. If this is the
case, the frequency automatically changes channels up to 4 times.
z
Communication faults are recognized within at maximum 100 s. Alarms and
interruptions of the radio communication are transmitted immediately.
5.6
Reed contact and button
The reed contact is an additional operation element by means of which some of the
button functions can be performed when the housing is closed.
In general, it is possible to activate the reed contact instead of the button with a
magnet upon commissioning. The reed contact is activated by briefly pressing the
button.
The reed contact is activated by slowly (for approx. one second) moving a magnet
alongside the reed contact.
see also:
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