Both the NovaTech Distributed Discrete I/O (DDIO) and Digital Combination I/O (DCIO) Sequence of Events Recording (SER) Modules are rugged signal conditioners. The modules are designed to present the state of field “inputs” to an attached Master device, as well as to accept output commands from a Master device and convert these commands to “outputs” to control field devices. The Orion DDIO/DCIO Modules communicate with the Master device using DNP3 protocol.