Detnov CAD-150-R, Руководство по установке

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2.7 - Sounder connection
The repeater has 2 sounder outputs, listed in the motherboard as SND1 and SND2. Each
monitored output can power conventional sounders with a total consumption of 450 mA.
It is imperative that the sounders are polarized, or a diode should be installed to prevent
the sounders from activating in standby condition. A end-of-line 4K7 Ohms resistor is
required.
When using sounders or bells which are not polarized, you must install a 1N4007 diode
in the + line (before the end of line resistor) to prevent the reverse current effect.