GENERAL DESCRIPTION
Control Module, Model EM-1SRI, is used to switch an external power supply or audio amplifier to notification appliances. In addition to switching the external power, the device will monitor the wiring (while external power is not switched to the auxiliary devices) to the auxiliary device for open and short circuits via an end of line resistor. This module is capable of Class A or Class B operation. The module also has on-board short circuit isolators to prevent shorts on the signaling line circuit from disabling more than one device on the intelligent loop.