glossary:glossary_h
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glossary:glossary_h [2016/10/04 17:13] – [Handset] Bob Vetterlein | glossary:glossary_h [2019/11/12 01:47] – [Hexadecimal or Hex] Bob Vetterlein | ||
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- | Is a means of control in your hand. \\ {{: | + | Is a means of control in your hand. \\ {{: |
===== Handshaking ===== | ===== Handshaking ===== | ||
- | Handshaking facilitates connecting relatively heterogeneous systems or equipment over a communication channel | + | In information technology, telecommunications, |
+ | |||
+ | ===== Happening ===== | ||
+ | A term devised, and introduced in the documentation | ||
+ | For instance, say input 1 changes from high to low, in early modules of the CBUS range this would simply produce an ON event with EN (Event Number) of 1, in the Universal code for the CANMIO it produces a ' | ||
+ | ===== HASL ===== | ||
+ | [[https:// | ||
===== Header plug or socket ===== | ===== Header plug or socket ===== | ||
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- | This is a track detector (ToTi) using an optical system to detect the location of a train. | + | This is a track detector ([[glossary: |
Merg kit (for members only) | Merg kit (for members only) | ||
+ | |||
+ | ===== Hexadecimal or Hex ===== | ||
+ | |||
+ | |||
+ | Computer data is a collection of binary bits, ones and zeros. Programmers generally collect bits into convenient sets of four bits (a nibble) or eight bits (a byte). | ||
+ | |||
+ | When it comes to writing and speaking the values of bits, rather than saying the value is 10010011, it is simpler to break the bits into small chunks and use a different number system. In the past collecting sets of three bits was common (Octal or base 8) but today sets of four bits are generally used (Hexadecimal or base 16). | ||
+ | |||
+ | Binary uses two characters to count before moving/ | ||
+ | |||
+ | You can say the address of a byte of data in memory is at location 0101010010101001 in binary or at 21,673 in decimal. Alternately the binary number is broken into sets of four bits (0101 0100 1010 1001) and each set is converted to a hex number (5 4 A 9). So it can be said that the byte of data is at memory location 54A9. The four digit 54A9 is easier to remember, shorter to say and less error prone to write. | ||
+ | |||
+ | When a hex number is used in a program or written text, it is usually proceeded by some characters to identify which number system you are using. | ||
+ | =====ASCII Hex===== | ||
+ | When sending numeric information over a serial link such as RS232 or RS485 it is not possible to send it as raw binary data as some of the possible 256 byte values have special meaning and are used to control the information flow, for an explanation of this see [[glossary_a# | ||
===== High ===== | ===== High ===== | ||
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- | ===== HYPOTRAC | + | ===== H0 ===== |
+ | Scale and gauge common in America, Asia and Europe but excluding UK. Scale 1:87, gauge 16.5 mm. | ||
+ | |||
+ | ===== HYPOTRAC ===== | ||
This a high voltage track detector system for 2 rail Model railway track , see TB T9/2 merg members only | This a high voltage track detector system for 2 rail Model railway track , see TB T9/2 merg members only | ||
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- | Hysteresis is wellknown | + | Hysteresis is well known in ferromagnetic materials. When an external magnetic field is applied to a ferromagnet, |
[[wp> | [[wp> | ||
glossary/glossary_h.txt · Last modified: 2021/08/08 04:50 by Wayne