Data acquisition

Multiple devices on one network. Popular in energy metering equipment.

Widely used, especially in industrial machines and scientific instruments.

Standard used for connection of computer peripherals like storage.

Inputs for gas and water meters.
Count pulses - registers usage.

Typically used to communicate with digital thermometers and weather instruments.

Electrically operated switches.
Turn on and off electrical circuits.

Typically used for industrial sensors
(eg. pressure, CO2, etc).