Installation manual

2K7 EOL resistor required

for UL installations

TamperTamper

Tamper

COM

0V - TR

Remove Link to

enable panel

case- tamper

CPU Tamper

Switch - (N.C.)

Tamper

Return.

European Versions

International Versions

Figure 2.12 Tamper Input connection

‘Negative Applied’ Detectors

Certain types of detector such as outside PIR’s and photocells provide

an open-collector output as a trigger rather than a relay output. This

type of signal can be connected directly into a zone terminal providing it

is a negative signal in one state and ‘floating’ in the other state. If the

signal goes negative when detecting, use a normally-open zone type

such as Type ‘8’ (normally-open switch). This is suitable for light

sensors or external non-alarming detectors which may be used as

monitors to drive Responses for lighting and CCTV applications.

The negative signal should be applied to non-eol zone where the trigger

wire connects just to one side of the zone, provided the detector has a

12v supply derived from the panel acting as a reference.

If tamper protection is required on the zone, three wires will be

required and the zone jumper should be removed from the header. A

single 2K7 resistor should be fitted in series with two of the wires at the

detector. The detector’s negative trigger should then connect to the

side of the resistor and wire which returns to the zone terminal and

Comfort Installation Manual