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Supervisory control and data acquisition (SCADA) is a system for remote monitoring and control that operates with coded signals over communication channels (using typically one communication channel per remote station).
SCADA especially is a term that has fairly recently been deprecated. In 2002 the International Society of Automation (ISA) started work on security standards for what it called industrial automation and control systems (IACS), under the aegis of its 99 standard.