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D6412/D4412
Onboard Sensor Loops
7.0
Onboard Sensor Loops
7.1
Description
The panel provides eight on-board sensor loops. Each sensor loop functions independently and does not
interfere with the operation of the others. The on-board sensor loops can be set to the default single point
configuration with a 2.2 k Ω End of Line (EOL) resistor, a single point configuration with 1 k Ω EOL resistor, a
single point configuration with a 3.65 k Ω EOL resistor, or in a doubled point configuration that utilizes two
resistors per sensor loop, one 2.2 k Ω and one 3.65 k Ω. The panel monitors two points per sensor loop in the
doubled configuration, making 15 on-board points available (see Section 7.6, Doubled Point Configuration).
The panel monitors the sensor loops for normal, shorted, or open conditions. Point programming determines
how the panel responds to those conditions. See the D6412/D4412 Program Entry Guide (P/N: 45351) for point
programming options.
The panel ignores sensor loops (both On-Board and Off-Board) for 60 seconds after power up to ensure that
any connected devices have stabilized.
7.2
Two-wire Smoke Detector Configuration
Sensor Loop 1 can be used as a fire point for connection of two-wire smoke detectors. This sensor loop cannot
be used for point doubling and must be terminated with a 2.21 k Ω EOL resistor (P/N: 25899).
See the D6412/D4412 Smoke Compatibility List (P/N: 46928) for compatible smoke detectors and the maximum
number of devices allowed on Sensor Loop 1.
7.3
Four-wire Smoke Detector Configuration
A four-wire smoke detector can be connected to any of the panel's on-board sensor loops (L-1 to L-8). A four-
wire smoke detector requires the use of a relay module to interrupt power to the detector in order for the
detector to reset.
The output controlling the relay must be configured as Output Function 1, 13 (Fire Verification). For more
information, refer to the Outputs section of the D6412/D4412 Program Entry Guide (P/N 45351).
If Sensor Loops 2-8 (L-2 to L-8) are used, make positive (+) connections to L-X + (where X=Loop #) and
negative (-) connections ot the loop's "COM" terminal.
45349D
D6412/D4412
L-1 +
L-1 -
Figure 9: Typical Two-Wire Smoke Detector Wiring
D6412/D4412 Installation Guide
Page 28
2.21 k
EOL
Resistor
© 2002 Radionics
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