User guide

3. Installation

Page 14 496929

FSL Connections

The control unit zone connectors provide space for up to eight FSL zones.

Each FSL zone is a ‘Fully Supervised Loop’ using a two wire closed loop. The

loop uses two resistors of different values to differentiate between ‘Circuit’ and

‘Tamper’ signals: a 2K2 resistor fitted in series at the end of the wired loop,

and a 4K7 resistor fitted across the alarm contact, see Figure 9.

With the loop in a normal state and the alarm contacts closed (shorting out the

4K7 resistor), the total resistance of the loop is 2K2. When the alarm contacts

open (removing the short from the 4K7 resistor) the resistance of the loop

increases to 6K9 and the control unit detects an alarm condition. If a tamper

device opens then the loop resistance will be open circuit and the control unit

detects a tamper signal.

To connect a detector to an FSL loop you must wire suitable resistors to the

detector. Always check resistor colour coding before wiring resistors into

circuit, see Figure 10.

The wiring resistance of the cable to the detector (including joints) should be

restricted to a maximum of 100 ohms. The recommended maximum cable

distance per zone is 200 - 300 metres.

Zone 1

Zone 2

2K2 EOL

4K7

Alarm contacts

Tamper contacts

2K2 EOL

4K7

Alarm contacts

Tamper contacts

Figure 9. FSL Connections

Yellow

Violet

Red

Gold

4k7

Red

Gold

2k2

Figure 10. Resistor Colour Code for FSL Resistors

Note: You can leave the global anti-tamper connectors unlinked if you are

using FSL wiring.

Using Programmable Outputs

In the 9651 OP1, 2 and 3 are "pull down type" outputs that provides negative

applied control signals. If necessary use command 159 to invert the output

polarity.