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The siemens Model TRI Series Addressable modules, 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 incor- porates an addressable Form C relay. The TRI-D 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 flashes twice, once for each address. The TRI-R red LED indicates a change of state in the relay.