Bosch Security Systems Inc. DS720I 用户手册
DS720i Installation Guide
© 2000 Detection Systems, Inc. All rights reserved.
Page 4
The complete circuit operation of the PIR/ Microwave
subsystems is checked every 5 hours. If the PIR or
Microwave subsystems fail two consecutive times, the
LED will flash red 4 times per cycle and the unit should
be replaced. The detector will default to PIR technology
protection if the Microwave subsystem fails. The PIR
processing will automatically be adjusted to reduce false
alarms. An intrusion alarm will reset most existing
supervision trouble conditions. There must be at least
10 seconds of no activity (no alarm) prior to the detector
alarm for a trouble clear to occur.
Microwave subsystems fail two consecutive times, the
LED will flash red 4 times per cycle and the unit should
be replaced. The detector will default to PIR technology
protection if the Microwave subsystem fails. The PIR
processing will automatically be adjusted to reduce false
alarms. An intrusion alarm will reset most existing
supervision trouble conditions. There must be at least
10 seconds of no activity (no alarm) prior to the detector
alarm for a trouble clear to occur.
6.0 Feature Selection
The DS720i's features are selected using a bank of 8 DIP switches.
See Figure 1 for a location of the DIP switches.
See Figure 1 for a location of the DIP switches.
See Figure 7 for default DIP switch positioning.
= ON (Low)
= OFF (High)
S1
S2
S3
S4
S5
S6
S7
S8
Figure 7: Default DIP Switch Positioning
The DS720i's features are assigned to the DIP switches as follows
(factory-set default settings in parentheses):
• S1: LED Operation (ON)
• S2: PIR Sensitivity: OFF - High; ON - Intermediate (ON)
• S3: Motion Monitor: see Table 2 (OFF)
• S4: Motion Monitor: see Table 2 (OFF)
• S5: mW Anti-Mask (OFF)
• S6: Anti-Mask Delay Timer (OFF)
• S7: PIR Anti-Mask (OFF)
• S8: PIR Spray Detect (OFF)
NOTE: To activate the spray detection feature, both switches S7
and S8 must be in the ON position.
Table 2: Motion Monitor DIP Switch Settings
Motion Monitor
S3
S4
Disabled
OFF
OFF
1 Day
ON
OFF
4 Day
OFF
ON
30 Day
ON
ON
6.1
LED Operation
The ON position allows operation of the LED. If LED indication is not
desired after setup and walk tests are completed, place in the OFF
position. The OFF position does not prevent the LED from indicating
supervision trouble conditions.
desired after setup and walk tests are completed, place in the OFF
position. The OFF position does not prevent the LED from indicating
supervision trouble conditions.
6.2
PIR Sensitivity Selection
High Sensitivity (S2 OFF): For fast response to intruder signals.
This setting will improve your intruder catch performance.
This setting will improve your intruder catch performance.
Intermediate Sensitivity (S2 ON): Tolerates normal environments
on this setting. This setting will improve your false alarm immunity.
on this setting. This setting will improve your false alarm immunity.
6.3
Motion Monitor
To set the Motion Monitor feature, refer to Table 2 for switches S3
and S4. The Motion Monitor Supervision feature verifies that each
technology has a clear view of the detection area. When selected,
a supervision timer is activated which gives the detector the ability
to indicate a supervision trouble condition if the time period has
elapsed since the last detector alarm. If the Memory feature is
used, the motion monitor time period will be increased by the
amount of time the detector is in the arm condition. If the detector
does not detect an alarm within the selected time period, the LED
will flash red 2 times to indicate a Motion Monitor Time-out
condition and the Trouble output will activate.
and S4. The Motion Monitor Supervision feature verifies that each
technology has a clear view of the detection area. When selected,
a supervision timer is activated which gives the detector the ability
to indicate a supervision trouble condition if the time period has
elapsed since the last detector alarm. If the Memory feature is
used, the motion monitor time period will be increased by the
amount of time the detector is in the arm condition. If the detector
does not detect an alarm within the selected time period, the LED
will flash red 2 times to indicate a Motion Monitor Time-out
condition and the Trouble output will activate.
6.4
Anti-Mask/Spray Detection
The Anti-Mask feature detects attempts made to disable the
detector by covering it. The DS720i has Microwave Anti-Mask, IR
Anti-Mask and Spray Anti-Mask as standard features. When
activated, the detector will indicate an Anti-Mask supervision
trouble condition if a microwave reflective material (e.g. metal,
most plastics, etc.) is placed within one foot of the detector.
detector by covering it. The DS720i has Microwave Anti-Mask, IR
Anti-Mask and Spray Anti-Mask as standard features. When
activated, the detector will indicate an Anti-Mask supervision
trouble condition if a microwave reflective material (e.g. metal,
most plastics, etc.) is placed within one foot of the detector.
The anti-masking feature may interpret removal and/or
replacement of the cover as an attempt to mask the
detector and may signal a supervision trouble
condition. If this should occur, reset the detector by
removing and then reapplying its power. The trouble
condition will also be reset by the next detector alarm
after a 10 second period of no alarms from both
technologies.
detector and may signal a supervision trouble
condition. If this should occur, reset the detector by
removing and then reapplying its power. The trouble
condition will also be reset by the next detector alarm
after a 10 second period of no alarms from both
technologies.
This anti-mask feature also has a delay timer function that can be
turned ON or OFF with the selection of switch S6. When enabled
(switch S6 ON), this feature evaluates the anti-mask condition for
false alarms. For maximum anti-mask/spray detection performance,
this timer should be turned OFF.
turned ON or OFF with the selection of switch S6. When enabled
(switch S6 ON), this feature evaluates the anti-mask condition for
false alarms. For maximum anti-mask/spray detection performance,
this timer should be turned OFF.
The Spray Detection feature prevents accidental or intentional
blocking of the detector by detecting an object placed in close
proximity of the detector, or if the detector is sprayed with a foreign
substance. See Figure 8 for details.
blocking of the detector by detecting an object placed in close
proximity of the detector, or if the detector is sprayed with a foreign
substance. See Figure 8 for details.
Distance
Anti-Mask
Transmitter
Distance
Distance:
Approximately
1 ft. (0.3 m)
with Spray
Detect OFF
Approximately
3 ft. (0.9 m)
with Spray
Detect ON
Approximately
1 ft. (0.3 m)
with Spray
Detect OFF
Approximately
3 ft. (0.9 m)
with Spray
Detect ON
Figure 8: Anti-Mask/Spray Detection Coverage