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Glossary

Term Description
Chassis Ground The ground point in a system, typically on a metal chassis, where signals connect to an earth ground. In most cases, a grounded chassis helps shield circuits from EMI and RFI, and provides a safety connection to ground. This type of ground should not carry current. See also: Analog Ground and Digital Ground.
Coil The wire-wound electromagnetic core of a relay or solenoid. See also: Relay and Solenoid.
COM 1. Abbreviation of "Communication" (e.g., COM Port). 2. Acronym for "Computer on Module", an integrated computing form factor (i.e., COM Express).
Common Reference A single reference point for one or more signals.
Complement In logic, an operation in which a logic 1 becomes a logic 0, and vice versa. In binary numbers, the complement of 101100 = 010011.
Coulomb (Symbol: C) A unit for measuring the electrical charge accumulated over one second of continuously receiving one amp of current (1 C = 1 A * 1 s). Named after Charles-Augustin de Coulomb (1736-1806). See: Amp
CPU Central Processing Unit - The decision-making part of a computer, usually found within a computer’s microprocessor.
CRC Cyclic Redundancy Check
Current (Electrical) A measure of the amount of electron flow in a circuit, typically measured in amperes (A) or milliamperes (mA).
Darlington Output A configuration of output transistors that can handle high currents. Usually found on the outputs of sensors or buffers that drive relays or solenoids.
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