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The SCM-4 module is used to monitor the contact status of a dry contact device (i.e, pull station, waterflow switch, etc) that contains a normally open contact. The SCM-4 can be programmed in the panel to supervise either a Normally-open or Normally-close contact on the Fire Alarm Control Panel (FACP). When the Normally-open contact is selected, and the contact is closed, the SCM-4 reports its condition to FACP. Likewise when the Normally-close contact is set as supervising condition, and the contact is opened, the MCM reports its condition to FACP. SCM-4 supervises an open circuit of wiring connected to the terminal C and NO.