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Glossary

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Term Description
Reed Relay A small relay comprising two magnetic contacts within a sealed glass envelope. When energized, a coil around the envelope moves the contacts to make a low-resistance connection. See: Relay.
Relay A device that opens or closes a circuit under control of a separate and isolated circuit. A mechanical relay uses a coil to actuate mechanical contacts. A solid state relay uses electronic devices to open or close circuit paths. Both types of relays isolate the controlling circuit from the circuit the relay controls.
Resistance The total amount of opposition to current in a circuit. Resistance carries the units of ohms and the Greek symbol omega, Ω. Resistance values may have units of kilohms, kΩ or megohms MΩ. See: Resistor.
Resistor A device that opposes or limits current flow. Usually noted in schematic diagrams as R. See: Resistance.
RFC-2217 A subprotocol of Telnet that added the abilities to (1) send com port configuration information, (2) send modem control signal updates, and (3) manage flow control.
RFI Radio Frequency Interference - Unwanted high-frequency signals, often generated by switching circuits, power supplies, computer cables, and oscillators. RFI may interfere with the proper operation of other circuits.
RTD Resistance Temperature Detector - A stable, linear temperature detector that provides a varying resistance in direct proportion to temperature changes.
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