KIDDE i/o module, from the 2000 series - zmu aritech, interface between detectors and panel, monitors up to 30 conventional detectors or 20 intrinsically safe conventional detectors, supervised zone for open circuits and short circuits. alarm verification and cleanme™ functions, occupies one address on the loop and is powered from it, . status led. remote pilot output., certifications: ce and cpr (en54 part 18).