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3. Installation 9752 Installation Guide

Page 22 11976870

Zone 1

Zone 2

2K2 EOL

4K7

Alarm contacts

Tamper contacts

2K2 EOL

4K7

Alarm contacts

Tamper contacts

Figure 12. FSL Connections

Yellow

Violet

Red

Gold

4k7

Red

Gold

2k2

Figure 13. Colour Code for FSL Resistors

Anti-Masking Zone Connections

Note: Connecting an anti masking detector to the 9751 does NOT make the

9752 a Grade 3 control unit.

Some PIR detectors are fitted with an anti-masking facility to detect cases

where the detector has been obscured. Depending on the type of detector,

the masking status is conveyed by one of two methods:

• Method 1: Using two pairs of contacts at the sensor. One pair reports the

alarm/tamper status and the other reports the anti-masking status. This

method requires two adjacent zones to be used at the 9752 control unit

(one for each pair of contact at the sensor), with the highest zone number

for anti-masking. For example, you could use zones 3 and 4, and in this

case, zone 3 must connect to the alarm/tamper contacts, and 4 to the anti-

masking contacts. The anti-masking zone (zone 4 in this example) must be

programmed as type "Anti-Mask". The alarm/tamper zone could, for

example, be programmed as type "Normal Alarm".

The anti-masking contacts from the sensor can connect to the 9752 using

the CCL, FSL or EOL connection method. In the case of FSL, there would

be no in-line tamper contacts (just the 2K2 end-of-line resistor and the 4K7

resistor across the anti-masking contacts). In the case of CCL, the zone's

tamper terminals at the 9752 must be shorted.

• Method 2: Applying a specified resistance value to a zone. The zone must

be wired as shown in Figure 14.

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