On-Board Sensor Loops; Description; Two-Wire Smoke Detector Configuration; Four-Wire Smoke Detector Configuration - Bosch D6412 Operation And Installation Manual

7.0

On-Board Sensor Loops

7.1

Description

The panel provides eight on-board sensor loops, each of which functions independently and does not interfere with the
operation of the others. On-board sensor loops can be set to the default single point configuration with a 2.2 kΩ End of Line
(EOL) resistor, a single point configuration with 1 kΩ EOL resistor, a single point configuration with a 3.65 kΩ EOL resistor,
or in a doubled point configuration that utilizes two resistors per sensor loop, one 2.2 kΩ, and one 3.65 kΩ. 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 sec. 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 (see Figure 8). This sensor loop cannot
be used for point doubling and must terminate a 2.21 kΩ EOL resistor (P/N: 25899). See the D6412/D4412 TSN: Smoke
Detector Compatibility (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 to 8 (L-2 to L-8) are used, make positive (+)
connections to L-X + (where X = Loop #) and negative (-)
connections to the loop's "COM" terminal.
See Figure 9.
© 2003 Bosch Security Systems
D6412/D4412
L-1 + L-1 -

Figure 8: Typical Two-Wire Smoke Detector Wiring

D6412/D4412 Operation and Installation Guide
Page 27
On-Board Sensor Loops
2.21 K EOL
Resistor
JP2-PO1
Select
R
Y
G
B
Alrm
Aux (+)
Aux (-)
D285/D285TH w/
D292 Base
D275
EOL Module

Figure 9: Typical Four-Wire Smoke Detector Wiring

D6412/D4412
Remove
Jumper Plug
from JP2
PO1
-
+
A B L-1
+
Smoke
Detector
2.21 K EOL
Resistor
EOL Relay
45349E