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© 2004 Bosch Security Systems
DS778 Installation Instructions
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Horizontally ±10° by rocking the mirror side to side.
When the detector is installed so that its pattern is centered
down a narrow hallway, the coverage will probably not be
adequate since the detector will be “looking” mostly at the
walls leaving an open channel down most of the hallway as
illustrated here:
Narrow Hallway
Detector centered, Pattern centered
Depending on the dimensions of the hallway this can be
compensated for by mounting it in the center and adjusting
the horizontal angle as illustrated here:
Narrow Hallway
Detector centered, Pattern rotated 1° (1 click)
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Walk test the installation carefully to ensure adequate
coverage. See
Figure D for horizontal angle adjustment
information.
Left/Right Pattern Adjust (1 click = 1°)
5°
10°
5°
10°
0°
0°
Figure D - Horizontal Angle Adjustment
3.0 Wiring
Only apply power after all connections have been
made and inspected.
• Connect wiring as shown in
Figure E.
Contacts shown in
nor mal condition (no
alarm or tamper) with
power applied.
- +
NO
NC
C
T
T
Alarm
Tamper
Figure E - Terminal Connections
• Seal the wire entrance with the foam plug provided.
3.1 Terminal Descriptions
• 1 (-) & 2 (+): Input Power (6 - 15 VDC). Use no smaller than
#22 AWG (0.8 mm) wire pair.
• 3 (NO), 4 (C), 5 (NC): Relay Contacts. Reed relay for silent
operation. Contacts rated at 3 watts, 125 mA, 28 VDC maximum
for DC resistive loads and protected by a 4.7 ohm resistor in the
common “C” leg of the relay.
Do not use with capacitive or inductive
loads.
• 6 & 7: Normally Closed Tamper Contacts, rated 28 VDC,
125 mA.
4.0 Configuration Switches
• Configure the detector using the appropriate switch settings
(see
Figure F).
Noise
Voltage
1
2 3
Tamper Switch
LED
Configuration
Switches
T-Strip
Chassis
Screw
O P E N
- +
NO
NC
C
T
T
1 ON = LED ON
1 OFF = LED OFF
2 ON and 3 OFF = High
2 OFF and 3 ON = Intermediate
2 ON and 3 ON = Not Recommended
ON
OFF
OPEN
1
2
3
Figure F - Configuration Switch Locations
4.1 LED Operation (S1)
• ON: Allows the LED to operate when activated by alarm.
• OFF: The LED will not operate on alarm.
4.2 Sensitivity Mode (S2 and S3)
• Intermediate Sensitivity: Recommended setting for any location
where an intruder is expected to cover only a portion of the
protected area. Tolerates normal environments on this setting.
• High Sensitivity: Fast response to intruder signals. For use in
quiet environments where thermal and illumination transients
are not anticipated.
5.0 Setup and Walk Testing
• Replace the cover on the unit. The cover should be in place
before testing the unit.
• Apply power to the detector.
• Wait for approximately two minutes, then start
walk testing.
• Walk test across the coverage pattern as
shown:
• The edge of the coverage is determined by
activation of the LED.
• Walk test the unit from both directions to determine the
boundaries.
• If the desired range cannot be achieved, try angling the mirror
up or down to assure the coverage pattern is not aimed too high
or low.
