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Term
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Description
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| Active High |
A digital signal that represents active, on, or true when its voltage is higher than the other logic state (low). Active-high signals can range from a few volts DC to as high as 24V DC, depending on the logic family or devices in use. |
| Active Low |
A digital signal that represents active, on, or true when its voltage is lower than the other logic state (high). Active-low signals can range from digital ground to a few tenths of a volt. |
| Analog |
A type of signal that varies continuously (lighter to darker, 4 to 20 mA, and so on), as opposed to a digital signal that can exist in only one of two possible states. |
| Analog Ground |
The location in a system that serves as a reference ground for all analog signals. Some circuits may combine analog ground and digital ground, but most circuits separate them to reduce noise and ground currents. |
| AND Gate |
A circuit that performs an AND operation based on the state of its inputs. |
| ASCII |
American Standard Code for Information Interchange - An 8-bit binary code that represents characters and symbols in the Roman (English) alphabet. ASCII includes codes that controlled older communication devices, thus the CRTL key on computer keyboards. |
| BCD |
Binary-Coded Decimal - The encoding of decimal numbers as four-bit binary values from 00002 for 0, to 10012 for 9. BCD uses only 10 of the 16 4-bit combinations. |
| Binary |
A numbering system that allows for only two states, usually 1 and 0. |
| Bit Wise |
An operation, usually between two bytes or words, in which corresponding bits take part in an operation. |
| Blocking Diode |
A diode, also called an isolation diode, that stops, or blocks, current from flowing through a circuit. Typically used in a battery circuit to prevent the reverse biasing of a battery by a more positive power supply. |
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