
70
Lifeline 4000 Advanced User Guide (B)
Copyright © 2000 Tunstall Group Ltd.
Hardwired Input
The Lifeline Home Unit is primarily designed
as a device for accepting radio-based inputs.
Nevertheless, one hardwired input is
available. The input should not provide a
voltage of any sort. Lifeline Home Unit
normally detects an input when the circuit
to its two input contacts is closed (i.e. the
circuit is made). Lifeline can also be set to
detect an input when a closed circuit is
opened, which can be useful when security
is an issue. The key points to note are:
1.
The input should not provide a
voltage—a circuit is either made or
broken (closed or opened) to indicate
triggering.
2.
The input circuit, when closed, must have a resistance less than 500 ohms.
3.
When the input circuit is open (i.e. broken or not made) it must have a resistance greater
than 30K ohms.
4.
Lifeline Home Unit provides a small wetting current of 300uA for the input. Some switches
will not work with such a small current. Make sure that the switch and circuit you have
selected is fit for the task and will work reliably with this current.
5.
Parameter 58 (see the section on
Triggers
in Chapter 3) can be used to set whether the
input is normally open or normally closed. This parameter also determines the type of
trigger connected to the input, and hence the action the Lifeline Home Unit will take when
the input is triggered.
While parameter 58 (see page 43) can be used to set the hardwired input to be almost any type of
trigger, the one exception is that the hardwired input cannot be a home care primer button. A
home care primer must be a radio trigger. The type the hardwired input can be set to (i.e. what it
means) is explained in the section on
Setting the trigger type
, on page 39.
Содержание Lifeline 4000
Страница 4: ...4 Lifeline 4000 Advanced User Guide B Copyright 2000 Tunstall Group Ltd...
Страница 24: ...24 Lifeline 4000 Advanced User Guide B Copyright 2000 Tunstall Group Ltd...
Страница 72: ...72 Lifeline 4000 Advanced User Guide B Copyright 2000 Tunstall Group Ltd...
Страница 74: ...74 Lifeline 4000 Advanced User Guide B Copyright 2000 Tunstall Group Ltd...
Страница 79: ...Copyright 2000 Tunstall Group Ltd Lifeline 4000 Advanced User Guide B 79...