Inovonics FA464DR - Manual (Page 10)

© 1999 Inovonics Wireless Corporation 02039F.DOC LIT-FA464-INSTALL
10
hc:21-Nov-03
Appendix A
FA464DR Receiver Parameters
Default
Active on
Output Condition Options for each output
1 Alarm ALARM / ALARM+TAMPER / TAMPER /
2 Alarm LO BATT / INACTIVE / TAMP+LO BATT /
3 Alarm TAMP+INACTIVE / LO BATT+INACTIVE /
4 Alarm ANY TX FAULT / DISABLED
...
...
16 Alarm
Transmitter Default
Condition Mode
Alarm Follower FOLLOWER / MOMENTARY / LATCHING
Inactive Follower "
Tamper Latching "
Low Batt Latching "
Default Momentary Output time: 4 seconds 1 - 16 seconds
Default Receiver Parameters:
System ID: (randomly assigned at factory) 0 - 255
Point supervision: Yes Yes / No
Supervision window*: 4 hours 1 - 99 minutes, 2 - 99 hours
(Note: use 60 minutes for 1-hour window)
Access code: 3446 0000 - 9999
Vision Plus compatible: No Yes / No
* Selecting appropriate Supervision Window values: Acceptable values for a supervision window permit
timely notification of inactive points but preclude false inactive reports.
A point is declared inactive as follows: The receiver looks for at least one supervisory transmission (or
"check-in") from each supervised transmitter during the period of time programmed as the supervisory
window. The first time the receiver gets a supervisory signal from a transmitter within a new window, it
considers the transmitter active for the remainder of the window. If it fails to get another signal in the
following supervisory window, it declares the point inactive at the end of the window.
The actual time between a transmitter becoming inactive and being reported inactive will range from slightly
more than the supervisory window value to slightly less than twice the window period. For example, the
default supervisory window is 4 hours. If a transmitter becomes inactive, the inactive fault output will be
triggered in 4 to 8 hours. There are many factors which can prevent individual check in transmissions from
reaching the receiver, so the greatest possible ratio of check-in signals to supervision window is desirable.
For example, typical default settings for Inovonics products include supervision windows of 4 hours and
transmitter check-in times at 60 seconds. In this case, the receiver has 240 "chances" to receive a check-in
transmission per supervision window period. Significantly decreasing this ratio increases the possibility that
the receiver will erroneously declare a point inactive.
When transmitters are set for 60-second check-in, a rule of thumb for setting the supervision window is to
allow at least one hour for each 16 transmitters in the system. Decreasing the supervision window to less
than one hour should only be done in consultation with Inovonics technical service.