Automation Direct D2-RMSM I Master Module

The Automation Direct D2-RMSM Serial Remote I/O Master Module is a DirectLogic DL205 accessory that serves as the remote I/O master in a RM‑NET/SM‑NET network, enabling expansion of a DL205 system’s I/O through remote slave modules. It is designed to work with D2‑RSSS remote slave modules to extend input/output capability beyond the CPU’s native I/O, while the remote master maintains its own diagnostics and memory for autonomous operation. The module includes rear-panel DIP and rotary switches for configuring baud rate and addressing, enabling precise network setup and addressing within a DL205 system. Official listings show UL file E157382 and CSA file 234884, with RoHS status listed as No. This item is a retired, discontinued product (withdrawn 04/2015) and has no direct replacement in AutomationDirect’s current catalog. In typical DL205 configurations, multiple remote masters can be used to scale I/O, with a documented example indicating up to 896 I/O points available when using two remote masters with seven slaves per module. This makes the D2-RMSM a historical but relevant option for legacy DL205 installations or retrofits that rely on RM‑NET/SM‑NET remote I/O expansion.