ComNav P4 Installation and Operation
Document PN 29010100 V1r0 - 63 -
Alternatively, you may choose to use the SW’D B+ and GND outputs as shown here:
Figure 41 – External Alarm, using SW'D B+ Output
Note: when using the External Alarm configuration shown in Figures 40 & 41, there is a
small current which will be flowing constantly between the pins, even when the alarm is off.
This will not be a problem with many types of alarms; however, with certain types of sensitive
Piezo-electric audible alarms, the leak current can cause a constant low-level tone from the
Piezo device.
An Application Note is available which describes this potential problem in detail, with
suggested remedies. The Note also lists a number of Piezo alarms which are known to work
well with P4 systems.
Please ask your ComNav Dealer (or go to ComNav’s web site) for Application Note 2007-01.
Installation
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