This article describes how to configure communication with devices using Modbus protocol. Simple and robust, Modbus has since become a de facto standard communication protocol, and it is now a commonly available means of connecting industrial electronic devices (see Wikipedia). Rapid SCADA supports Modbus RTU, ASCII and TCP modes.
This article describes how to configure communication with devices using OPC standard. OPC is designed to provide a common bridge for the software and process control devices from different manufacturers (see Wikipedia). Rapid SCADA supports the following OPC specifications:
OPC DA (Data Access) to read and write current device data.
OPC AE (Alarms & Events) to receive event notifications.
