Addressable control modules interface the serial line circuit (SLC) with other equipment allowing the fire alarm control panel additional control relay or output circuits.  In the first diagram below a relay type module is interface with the SLC.  The second diagram is a output circuit.

The M500R Relay Control Module is intended for use in intelligent, two-wire systems, where the individual address of each  module is selected using the built-in rotary decade switches. It  allows a compatible control panel to switch discrete contacts by  code command. The relay contains two isolated sets of Form-C  contacts, which operate as a DPDT switch and are rated in accordance with the table in the manual. Circuit connections to the  relay contacts are not supervised by the module. The module also  has a panel controlled LED indicator. This module can be used to  replace an M500C module that has been configured for Form-C  operation.

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M500S Supervised Control Modules are intended for use in intelligent, two-wire systems, where the individual address of each  module is selected using the built-in rotary decade switches. This  module is used to switch an external power supply, which can  be a DC power supply or an audio amplifier (up to 80 VRMS), to  notification appliances. It also supervises the wiring to the connected loads and reports their status to the panel as NORMAL,  OPEN, or SHORT CIRCUIT. The M500S has two pairs of output  termination points available for fault-tolerant wiring and a panelcontrolled LED indicator. This module can be used to replace an  M500C module that has been configured for supervised wiring  operation.

 
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