DIOT Mixed Digital IO RTM
aka ‘MDIOR’
It is a Rear Transition Module for the DI/OT crate v2 and part of the Distributed I/O Tier project ecosystem. Its main purpose is to interface (slow) controls with isolated input/output channels, connected to the RTM_SHARED_BUS but it also has a few direct TTL-compatible IOs for a more generic usage when driven by a Peripheral Board directly.