Atest Gaz Alpa EcoDet XT, Руководство пользователя

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6.1 Star layout
Within a gas detection system arranged according to the conventional architecture any individual detector is
directly connected to a central control unit. Such a solution needs routing of great many cables to a single
control unit, which makes installation of a system quite difficult and cost of cabling is pretty large.
Figure 4: Connection with the Alpa MOD LED8 Control Unit into a star-shaped system
The detailed schematic diagram for such a layout is provided in Appendix [3].
6.2 Bus layout with an open alarm loop
Such a layout assumes that gas detectors are arranged in a chain and connected to a common
communication bus by means of T-connectors of the XT type. The layout offers substantial benefits since
installation of the system is much easier and cost of cabling can be reduced.
Figure 5: Connection with the Alpa MOD LED1 Control Unit into an open bus system
The detailed schematic diagram for such a layout is provided in Appendix [3].
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User Manual: POD-043-ENG R03