UM0272 datasheet(13/40 Pages) STMICROELECTRONICS

13 / 40 page

UM0272

System hardware configuration

13/40

System hardware configuration

3.1

Introduction

The hardware configuration greatly depends on the area to protect. The CU is very flexible

due to its easy way to program each input and output line. It is possible to configure a more

powerful system using bus modules to expand the features.

It is possible to manage, for example, two different areas independently or with one or more

zones in common; it all depends on how the CU is configured.

Using the GSM module, it is possible to know the CU or the zones status, enable or disable

the partitions, or perform several actions on the outputs remotely.

Thanks to the fully configurable outputs, it is possible to decide which device to connect

(sirens, external devices, etc.), the activation time, working mode, etc.

3.2

Sensor connections

The sensors must be connected to the zone terminals (connectors J20 and J21, connectors

J23 and J24) as shown in Figure 6. It is possible to connect a balance resistor in series with

the sensor switch to detect both line cutting and line short-circuiting. Even the tamper line

can be balanced.

Moreover, thanks to the autobalance control feature (see Zones Autobalance on page 31), it

is possible to place more than one resistor in series with the tamper line (each tamper

switch must be connected in series to all the others). This configuration enables a more

efficient balance control of the tamper line than when placing only one resistor.

Figure 6.

Sensor wiring diagram

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