D9000/D7000 Series Operation & Installation Manual
Page 25
74-07692-000-C 4/97
On-Board Points
Point Parameters
You can determine the condition of on-board
points 1 to 8 by measuring the voltage across the
point input terminal and one of the common
terminals. The sensor loops must be connected
and the 1k ohm end of line resistor in place.
Open Loop
= Greater than 3.7 VDC, but less
than 5.0 VDC.
Normal Loop = Greater than 2.0 VDC, but less
than 3.0 VDC.
Shorted Loop = Greater than 0.0 VDC, but less
than 1.3 VDC.
Point Response Time
The panel scans both on-board and off-board
point sensor loops every 300 milliseconds. The
Debounce Count program item in the Point
Assignment module determines point response
time by setting the number of scans that a point
must be faulted before the panel initiates an
alarm.
The debounce count can range from 1 to 15.
Therefore point response time ranges from 300
milliseconds to 4.5 seconds. The Radionics
default for Debounce Count is 2.
Warning, increasing debounce count may
cause missed alarms: If you increase the
Debounce Count, detection devices may go into
alarm and reset without exceeding the point
response time.
Radionics recommends you leave the debounce
count at 2 for all points except for Interior
Follower points, which should be programmed as
a 3.
Description
Terminals
11
to
22
The panel provides eight on-board points. Each
point functions independently and does not
interfere with the operation of the others. The
panel monitors the sensor loops for normal,
shorted, or open conditions between an input
terminal (11, 13, 14, 16, 17, 19, 20, or 22) and
any of the point common terminals (12, 15, 18,
and 21). Programming for the point determines
how the panel responds to those conditions. See
the
D9000/D7000 Series Program Entry Guide
(74-07695-000) for point programming options.
Point Sensor Loops
When wiring the on-board points, install a 1k ohm
resistor at the far end of the sensor loop to
provide a reference for supervision. You can
connect dry contact sensing devices in series
(normally-closed) and/or in parallel (normally-
open) to any of these loops.
The number of normally-open and/or normally-
closed detection devices each sensor loop can
supervise is limited only by the resistance on the
loop. The total resistance for wire length and
contacts, minus the end-of-line resistor, must not
exceed 100 ohms.
Ground shunts cause missed alarms: The
possibility of “ground shunts” increases
significantly if you don’t install the resistor at the
end of the line. If you install the resistor for points
1 to 8 before a detection device on the sensor
loop and the loop becomes grounded after the
resistor, any devices beyond the ground are
“ground shunted”. Alarm or trouble conditions
beyond the ground are not seen by the panel.
POINT INP UT
TE RM INAL
CO MM ON
POINT INP UT
TE RM INAL
CO MM ON
POINT INP UT
TE RM INAL
CO MM ON
NO RM ALLY CLOSE D CO NTACTS
NO RMA LLY OPEN CO NTACTS
CO MBINATIO N: NO RM ALLY OPEN CO NTACTS
AN D NOR M ALLY CLOSED CO NTACTS
RADIONICS MOD EL
D105F OR D 105BL (UL
LISTE D BUR GLAR
APP LIC AT IO NS)
EN D-OF-LINE
R ESIS TO R
BR OW N
BLACK
R ED
1K
Ω
100 O H M S M A X IM U M
Figure 11: On-board Point Sensor Loop Wiring
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