8
6. Operation using batteries and power
supply
a) Operation using batteries
The advantage of battery operation is that it allows totally self-sufficient
system operation.
The drawback of battery-only operation is that the wireless receiver in the PC
interface is not continuously switched on due to its high power consumption,
otherwise the batteries would be used up too quickly.
In order to reduce the amount of power that is used the radio receiver is only
switched on for a short time every 5 seconds. This means that, in the case
of a alarm, the alarm base station must transmit the radio signal for 10 seconds.
During these 10 seconds you cannot stop the alarm. An alarm delay of approx.
5 seconds is also generated.
You can use rechargeable batteries to operate the device. However, due to
the lower voltage (rechargeable battery= 1.2V, battery: 1.5V), the period of
operation and the range are reduced. In some cases it will not be possible to
use rechargeable batteries, as the PC interface continues to send a ‘battery
empty’ signal, even when the rechargeable cells are fully charged, thus causing
a disturbance message.
Therefore to ensure safe operation and increase the operating
time you should only use high-quality alkaline batteries.
b) Operation using a power supply
When operating the device with an additional power supply (12V=, 100mA,
middle contact must be ‘plus’/‘+’, not supplied) the receiver is permanently
switched on and the batteries are only used as an emergency power supply,
when a power outage occurs, for example.
Therefore, 4 ‘baby’ (C) size batteries should always be inserted.
When the PC Interface uses an external power supply, the alarm base station
briefly sends a radio signal which immediately sets off the alarm.