The HFI-IO-404-01 multi-module series is a composed of 4 input channels and 4 output channels. Microprocessor controlled interface devices permitting the monitoring and control of auxiliary devices. These are loop powered devices that operate according to the Hyfire analogue-intelligent protocol and are characterised by low current consumption; their particular design allow an easy and fast installation. A channel is a multi-module’s sub-device through which monitoring and control of analogue-loop-extraneous auxiliary devices is exerted by the analogue control panel. Multi-modules are, by a matter of fact, multi-channel devices.