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Glossary

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Term Description
Boolean Logic A form of mathematics named after George Boole (1815-1864) who devised formal expressions for AND, OR, and INVERT operations.
BRG Baud Rate Generator
Buffer An output device that operates high-current or high-voltage devices. Some manufacturers produce drivers specifically to control devices such as stepper motors or displays. See: Driver.
Buffered A signal that has passed through a buffer. See: Buffer.
Bus A group of related electrical signals. 1. A control bus, an address, bus, a data bus, and so on. Some buses carry specific names, such as PCI Bus and Universal Serial Bus (USB). 2. A group of conductors that distribute power.
Capacitor An electronic component that stores a charge and provides a reserve of power in a circuit. Typically used to smooth variations in a power-supply’s output voltage, and to provide power in the event of brief power failures.
Carry Current The amount of current a relay’s contacts can safely conduct after the contacts close.
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).
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