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[Back to Index](/Documents/Protocol/index.md)
UNIT Field for SENSOR Message
=============================
- Protocol Version: 3.0
- Release Date: January 20, 2017
Summary
=======
SENSOR message can handle a part of units defined in The International System
of Unites (SI) in its 8-byte (or 64-bit) field. The field is designed to
specify a unit consisting of SI-prefix (e.g. milli, micro, kilo etc...) and
a combination of SI-base and/or SI-derived units. The bites in the field are
assigned as follows:
~~~~
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...
|PREFIX | UNIT0 | EXP0 | UNIT1 | EXP1 | UNIT2 | EXP2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-...
0 1 2 3 4
...-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
EXP2 | UNIT3 | EXP3 | UNIT4 | EXP4 | UNIT5 | EXP5 |
...-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4 5 6 7
~~~~
PREFIX (4bit)
-------------
Value | SI-Prefix
--------------|-----------------
0x0 | None
0x1 | deka (deca)(1e1)
0x2 | hecto (1e2)
0x3 | kilo (1e3)
0x4 | mega (1e6)
0x5 | giga (1e9)
0x6 | tera (1e12)
0x7 | peta (1e15)
-- | --
0x9 | deci (1e-1)
0xA | centi (1e-2)
0xB | milli (1e-3)
0xC | micro (1e-6)
0XD | nano (1e-9)
0XE | pico (1e-12)
0XF | femto (1e-15)
UNIT(6bit)
----------
- SI Base Units
Value | SI Base Unit Name
--------------|-------------------
0x01 | meter
0x02 | gram
0x03 | second
0x04 | ampere
0x05 | kelvin
0x06 | mole
0x07 | candela
- SI-Derived Units
Value | Unit Name | Dimension
--------------|-----------------|---------------------------
0x08 | radian | meter/meter
0x09 | steradian | meter^2/meter^2
0x0A | hertz | /second
0x0B | newton | meter-kilogram/second^2
0x0C | pascal | kilogram/meter-second^2
0x0D | joule | meter^2-kilogram/second^2
0x0E | watt | meter^2-kilogram/second^3
0x0F | coulomb | second-ampere
0x10 | volt | meter^2-kilogram/second^3-ampere
0x11 | farad | second^4-ampere^2/meter^2-kilogram
0x12 | ohm | meter^2-kilogram/second^3-ampere^2
0x13 | siemens | second^3-ampere^2/meter^2-kilogram
0x14 | weber | meter^2-kilogram/second^2-ampere
0x15 | tesla | kilogram/second^2-ampere
0x16 | henry | meter^2-kilogram/second^2-ampere^2
0x17 | lumen | candela-steradian
0x18 | lux | candela-steradian/meter^2
0x19 | becquerel | /second
0x1A | gray | meter^2/second^2
0x1B | sievert | meter^2/second^2
- EXP (4-bit)
Value | Exponent
--------------|---------------
0x0 | ^0
0x1 | ^1
0x2 | ^2
0x3 | ^3
0x4 | ^4
0x5 | ^5
0x6 | ^6
0x7 | ^7
-- | --
0xF | ^-1
0xE | ^-2
0xD | ^-3
0xC | ^-4
0XB | ^-5
0XA | ^-6
|
