TRI-S Siemens Intelligent Interface Single Input Module The Model TRI-S Siemens Addressable modules from Siemens Industry, Inc., shown in Figure 1, interface direct shorting devices to the MXL System's ALD loop circuit. Note: The TRI-S/-D/-R Series is not compatible with the XL3 System or the XLD-1 loop circuit. The TRI modules are available in three models. The TRI-S and TRI-R can monitor a normally open or closed dry contact. The TRI-S model can only monitor and report the status of the contact, while the TRI-R incorporates an addressable Form C relay. The TRI-D Siemens is a dual input module that supervises and monitors two sets of dry contacts. It requires two address settings. The TRI has a multi-color LED that flashes green when operating normally, amber if the unit is in trouble condition, and red to indicate a change of state. The TRI-D Siemens flashes twice, once for each address. The TRI-R red LED indicates a change of state in the relay. The use of the relay is programmable. Series Intelligent interface modules are designed to provide the means of interfacing direct shorting devices to the fire alarm control panel (FACP) loop circuit. The TRI-series modules provide the most advanced method of address programming and supervision on the market combined with sophisticated(more...)