User Manual

Siemens Building Technologies

Cerberus Division

e1143b

06.2000

tion, the control panel will transmit a message to the management station that reflects

the status of the device. Up to 16 different states are available for each security/safety

device. The messages coming from up to 16 control panel are collected by a dedicated

front-end processor, the Gateway GW-20. This microprocessor-based device polls the

control panels and communicates with the PC-based management station.

FSS

The Foreign Supervision System is a system supplied by a third-party manufacturer

that monitors technological plant.

The FSS should comply with Cerberus Dati Standard Protocol (CDSP) specification

and it will be seen by LMS as a standard subsystem.

FHI Pad behaves as a slave, while FSS behaves as a master.

CDSP consists of two levels:

- data-link level (CDDL Cerberus Dati Data Link)

- application level (CDSF Cerberus Dati Standard Format).

FHI Pad needs both the application level (CDSF) and the data link level (CDDL). FHI

Pad is able to deal with frames, which can contain up to 8 standard mes-

sages/commands.

Standard Protocol deals with standard subsystem which consists of one (or more)

items, when we have more than one item we talk of "cluster of items".

Each item consists of points, which give together the whole status of equipment.

The FHI Pad that implements the interface functions is composed of a hardware board

to be inserted in the Cerberus' Gateway GW-20 and a software package installed in an

EPROM bank on the board

CDSF Application layer

Data - link layer

Application layer

Data - link layer

FHI - PAD Foreign Host

CDDL

Fig. 2 CDDL and CDSF role in FHI Pad and FSS communication

The FHI Pad is therefore an extension of GW-20 capabilities and it is sold as an add-on

device to standard Gateway GW-20. The FHI Pad provides communication using the

CDSP (Cerberus Dati Standard Protocol) protocol.

To operate the FHI Pad properly requires a site specific configuration EPROM, which is

made using a special utility tool, called FHI_CNF, designed to run on a service-PC.