Edwards EST SIGA-UM Universal Class A/B ModuleThe Edwards EST SIGA UM universal Class A B module is an intelligent addressable input output device for Signature Series loops, configurable by personality codes to serve as dual Class B or single Class A IDC, Class A or B NAC, 2 wire smoke detector circuit, or a Form C dry relay output. Its on board microprocessor supervises field wiring, reports detailed status back to the loop controller, and lets one module type cover multiple applications to