MTL4842 HART INTERFACE MODULE MTL systems interface : Links up to 16 loops via backplanes Receives multiplexer control signals via interface bus from MTL4841 and selects one channel for communication Unit address : Switch selectable on top of module Interface bus : Total length of interface bus between module 1 and module 16 must not exceed 4m LED indicators Green : one provided for power, Amber: one to indicate unit is selected by MTL4841, Red: four to identify loop address Power requirements : Powered from backplane Power consumption : <0.1W