OpenIGTLink/ProtocolV2/Unit
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SI base units
SI derived units
SENSOR message can handle a part of unites defined in The International System of Unites (SI) in its 8-byte (or 64-bit) field. The field is designed to specifiy a unit consisting of SI-prefix (e.g. milli, micro, kilo etc...) and combination of SI-base and/or SI-derived unites. 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 | Value | SI-prefix |
| 0x0 | None | -- | -- |
| 0x1 | deka (deca) (1e1) | 0x9 | deci (1e-1) |
| 0x2 | hecto (1e2) | 0xA | centi (1e-2) |
| 0x3 | kilo (1e3) | 0xB | milli (1e-3) |
| 0x4 | mega (1e6) | 0xC | micro (1e-6) |
| 0x5 | giga (1e9) | 0XD | nano (1e-9) |
| 0x6 | tera (1e12) | 0XE | pico (1e-12) |
| 0x7 | peta (1e15) | 0XF | femto (1e-15) |
UNIT(6bit)
| Value | SI base unit name | Value | SI base unit name |
| 0x01 | meter | 0x05 | kelvin |
| 0x02 | gram | 0x06 | mole |
| 0x03 | second | 0x07 | candela |
| 0x04 | ampere | -- | -- |
| Value | Unit name | dimension | Value | Unit name | dimension |
| 0x08 | radian | meter/meter | 0x12 | ohm | meter^2-kilogram/second^3-ampere^2 |
| 0x09 | steradian | meter^2/meter^2 | 0x13 | siemens | second^3-ampere^2/meter^2-kilogram |
| 0x0A | hertz | /second | 0x14 | weber | meter^2-kilogram/second^2-ampere |
| 0x0B | newton | meter-kilogram/second^2 | 0x15 | tesla | kilogram/second^2-ampere |
| 0x0C | pascal | kilogram/meter-second^2 | 0x16 | henry | meter^2-kilogram/second^2-ampere^2 |
| 0x0D | joule | meter^2-kilogram/second^2 | 0x17 | lumen | candela-steradian |
| 0x0E | watt | meter^2-kilogram/second^3 | 0x18 | lux | candela-steradian/meter^2 |
| 0x0F | coulomb | second-ampere | 0x19 | becquerel | /second |
| 0x10 | volt | meter^2-kilogram/second^3-ampere | 0x1A | gray | meter^2/second^2 |
| 0x11 | farad | second^4-ampere^2/meter^2-kilogram | 0x1B | sievert | meter^2/second^2 |
EXP (4-bit)
| Value | Exponent | Value | Exponent |
| 0x0 | ^0 | -- | -- |
| 0x1 | ^1 | 0xF | ^-1 |
| 0x2 | ^2 | 0xE | ^-2 |
| 0x3 | ^3 | 0xD | ^-3 |
| 0x4 | ^4 | 0xC | ^-4 |
| 0x5 | ^5 | 0XB | ^-5 |
| 0x6 | ^6 | 0XA | ^-6 |
| 0x7 | ^7 | 0X9 | ^-7 |
