Edwards EST SIGA-MAB Universal Class A/B UIO ModuleThe Edwards EST SIGA MAB universal Class A B module is the UIO plug in version for Signature Series loops, configurable by personality codes to operate as a Class A or B initiating device circuit, 2 wire smoke detector circuit, or notification appliance circuit. It plugs into UIO motherboards for clean panel mounting, supervises field wiring for opens and shorts, and uses on board green and red LEDs plus an integral microprocessor to report precise