Intelligent IoT I/O gateways with Node-RED analog, digital, or relay I/O connect edge to Azure cloud, SQL through MQTT, SNMP, RESTful, 3G, and WiFi. A remote terminal unit (RTU) is a microprocessor-based electronic device used in industrial control systems (ICS) to connect various hardware to distributed control systems (DCS) or supervisory control and data acquisition (SCADA). RTUs are also referred to as remote telemetry units or remote telecontrol units.
As a remote gateway, an RTU uses Ethernet and serial interfaces for networking with intelligent devices, IP cameras and wireless sensor networks. An RTU is an electronic device utilizing a microprocessor, which links objects in the physical world with an automation system. This is accomplished by transmitting telemetry data to the system and/or changing the physical state of connected objects based on control messages received from the automation system.
Small-sized RTUs. Small remote alarm units have around 16 discrete alarms and 2 analog alarms. Medium-sized RTUs. Medium remote alarm units have around 32 discrete alarms, 8 analog alarms, and control relays. Large-sized RTUs. RTU consumes less power as compared to a PLC. Also, they work on different voltage potentials; not just limited to 24V DC or 230V AC. One of the main reasons for such a design is its location. There are cases when the power supply is very less and is not enough to drive a controller.
