D3-DCM Data Communications Module Manual

This document describes the D3-DCM, a retired general-purpose communications interface module for the DL305 family of PLCs, which works exclusively with D3-350 CPUs and requires a "-1" type base. It provides extra communication ports for connecting devices like PCs and operator interfaces, and supports DirectNET and MODBUS RTU protocols for network master/slave and peer-to-peer configurations.