478 terms ch 02

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Author:
samantha886
ID:
201904
Filename:
478 terms ch 02
Updated:
2013-02-19 21:52:13
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Description:
terminology chapter 2
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  1. the character string consisting of a combination of letters,
    numbers, and/or special characters used to represent text, commands, numbers,
    and/or code groups.
    alphanumeric code
  2. A seven-bit code with an optional parity bit
    used to represent alphanumeric, punctuation, and control characters.
    ASCII
  3. the maximum number of digits
    used to represent values in a number system.
    base
  4. a binary number system in which each decimal
    digits from 0 to 9 is represented by four binary digits.
    Binary coded decimal (BCD)
  5. the smallest unit of binary information.
    bit
  6. a group of eight adjacent bits that are operated
    on as a unit, such as when moving data to or from memory.
    byte
  7. a base 10 number system that uses 10 numbers.
    decimal system
  8. a cyclic code, similar to binary code, in which only one bit changes as the counting
    number increases.
    gray code
  9. a base 16 number system that uses 0 through 9 and A through F to represent numbers and codes.
    hexadecimal
  10. the bit representing the smallest value in a
    nibble, byte, or word.
    LSB
  11. the digit representing the smallest value in a byte or word.
    LSD
  12. the bit representing the largest value in a nibble, byte, or
    word.
    MSB
  13. The digit representing the greatest value of a byte or word.
    MSD
  14. a group of four bits
    nibble
  15. the base 8 number system that uses eight numbers to represent all values.
    octal
  16. an operation that represents the negative value of a binary word by assigning the most significant bit of the word with the
    value equal to its normal value minus one.
    one's complement
  17. a temporary storage device for data and
    information. A PLC register is normally 16 bits wide.
    register
  18. a method of changing values from other number systems into their decimal equivalents by multiplying each digit by the weighted
    value of its position and then summing the results.
    Sum-of-the-weights method
  19. a numbering system, used to express negative
    binary numbers, in which all members from right to left our inverted after the
    first 1 is detected.
    two's complement
  20. the numerical value assigned to any single bit as a function
    of its position in a word.
    weighted value
  21. the number of bits that the CPU operates on at one time when it is performing an instruction or operating on data. A word is
    usually composed of a fixed number of bits.
    word

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