Raven EDGE
The RTU connects to physical equipment such as switches, pumps, and other devices and monitors and controls these devices. The RTU can be part of a network set up for Super‐ visory Control and Data Acquisition.
Supervisory Control and Data Acquisition (SCADA)
Supervisory Control and Data Acquisition (SCADA) describes solutions across a large variety of industries and is used in industrial and engineering applications to monitor and control distributed systems from a master location. SCADA encom‐ passes multiple RTUs, a central control room with a host computer (or network), and some sort of communication infra‐ structure.
SCADA allows for “supervisory” control of remote devices as well as acquiring data from the remote locations. Program‐ mable Logic Controllers allow for a higher degree of automated SCADA.
Programmable Logic Controller (PLC)
A Programmable Logic Controller (PLC) is a small industrial computer which generally monitors several connected sensor inputs and controls attached devices (motor starters, solenoids, pilot lights/displays, speed drives, valves, etc.) according to a user‐created program stored in its memory. Containing inputs and outputs similar to an RTU, PLCs are frequently used for typical relay control, sophisticated motion control, process control, Distributed Control System and complex networking.
Modbus TCP/IP
Modbus TCP/IP simply takes the Modbus instruction set and wraps TCP/IP around it. Since TCP/IP is the communications standard for the Internet and most networked computers, this provides a simpler installation. Modbus TCP/IP uses standard Ethernet equipment.
Raven Modbus on UDP
When Sierra Wireless AirLink modems are used in place of radios, a Raven is connected to the central station (host) and aRaven is connected to each remote unit. When the Raven is configured for Modbus with UDP, the Raven connected to the host can store a list of IP addresses or names with matching IDs. When the host at the central station sends serial data as a poll request, the Raven at the host matches the RTU ID to a corresponding IP of a Raven at a remote unit. A UDP packet is assembled encapsulating the RTU ID and serial data trans‐ mitted from the host. The UDP packet is then transmitted to the specific Raven at the remote unit matching the RTU ID.
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