Models SD365 and SD365-IV are plug-in type smoke sensors that combine a photoelectronic sensing chamber with addressable-analog communications. The sensors transmit an analog representation of smoke density over a communication line to a control panel. Rotary dial switches are provided for setting the sensor’s address. SD365-IV will support either LiteSpeed or CLIP (Classic Loop Interface Protocol) mode. The possible features available if supported by the control panel are: 1. The sensor’s LEDs can operate in three ways—on, off, and blinking–and they can be set to red, green, or amber. This is controlled by the panel. 2. The remote output may be synchronized to the LED operation or controlled independent of the LEDs. 3. Devices are point addressable up to 159 addresses.