User Manual

Cerberus Division

Interactions

e1754.doc

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land 1999

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4.2 The source message

Fig. 4-2

The meaning of fields in the previous picture is as follows:

Description this is the text that describes the interaction on the source message

side. It could be for instance "Fire alarm Zone 1 Building 10"

Subsystem this the Line number (as defined on the Line dialog box) on the

GW21 connected to the subsystem for which you wish to define the

interaction.

Len (Dec) is the number of byte in the source message . The configurator

checks that the number of bytes here specified equals the number

of bytes written in the Data fields below.

Data (Hex) is the actual message as it is transferred on the line.

Reaction no. is the number of the reaction triggered by the source message

4.3 How to configure a reaction

For this reason the interaction program configuration is a three step process:

1. identify the subsystem that will generate the message that triggers the interaction;

to do so, highlight in the Line Dialog box the Line to which the subsystem is con-

nected.

2. define the message (called the initiating message) that triggers the interaction; to

do so, select Interactions and from the pull down menu select the Source menu

option.

3. define the interaction program, i.e. write the messages that have to be sent to one

or more of the gateway subsystems; to do so, select Interactions and from the

pull down menu select the Reactions menu option.

Please note that the Interactions menu option deals only with the Line currently

highlighted. To modify or add interactions to a Line, you must first select it from the

Line list and then access the Interactions menu item.