The main module is the Master Control Unit of the Link system. One Main Module is
required for each Link system.
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The Cellular Module provides a cellular based phone connection via internal GSM
or HSPA module.
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The Telephone Module provides a land based telephone line connection, as well as
connections for Radio or Public Access to announce alarms.
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The Analog IO module provides eight current loop and eight voltage inputs.
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The Digital IO module provides an additional 16 ground closure digital inputs.
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The Link PLC module provides connectivity with Allen Bradley and Modicon PLC's.
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