knx/src/dptlib/dpt14.js

KNXnet/IP protocol implementation for Node(>=6.x)

/**
 * knx.js - a KNX protocol stack in pure Javascript
 * (C) 2016-2018 Elias Karakoulakis
 */

const log = require('log-driver').logger;

//
// DPT14.*: 4-byte floating point value
//

/* In sharp contrast to DPT9 (16-bit floating point - JS spec does not support),
 *  the case for 32-bit floating point is simple...
 */

exports.formatAPDU = (value) => {
  if (value == null || typeof value != 'number')
    log.error('DPT14: Must supply a number value');
  const apdu_data = Buffer.alloc(4);
  apdu_data.writeFloatBE(value, 0);
  return apdu_data;
};

exports.fromBuffer = (buf) => {
  if (buf.length != 4) log.warn('DPT14: Buffer should be 4 bytes long');
  return buf.readFloatBE(0);
};

// DPT14 base type info
exports.basetype = {
  bitlength: 32,
  valuetype: 'basic',
  range: [0, Math.pow(2, 32)],
  desc: '32-bit floating point value',
};

// DPT14 subtypes info
exports.subtypes = {
  // TODO
  '007': {
    name: 'DPT_Value_AngleDeg°',
    desc: 'angle, degree',
    unit: '°',
  },

  '019': {
    name: 'DPT_Value_Electric_Current',
    desc: 'electric current',
    unit: 'A',
  },

  '027': {
    name: 'DPT_Value_Electric_Potential',
    desc: 'electric potential',
    unit: 'V',
  },

  '028': {
    name: 'DPT_Value_Electric_PotentialDifference',
    desc: 'electric potential difference',
    unit: 'V',
  },

  '031': {
    name: 'DPT_Value_Energ',
    desc: 'energy',
    unit: 'J',
  },

  '032': {
    name: 'DPT_Value_Force',
    desc: 'force',
    unit: 'N',
  },

  '033': {
    name: 'DPT_Value_Frequency',
    desc: 'frequency',
    unit: 'Hz',
  },

  '036': {
    name: 'DPT_Value_Heat_FlowRate',
    desc: 'heat flow rate',
    unit: 'W',
  },

  '037': {
    name: 'DPT_Value_Heat_Quantity',
    desc: 'heat, quantity of',
    unit: 'J',
  },

  '038': {
    name: 'DPT_Value_Impedance',
    desc: 'impedance',
    unit: 'Ω',
  },

  '039': {
    name: 'DPT_Value_Length',
    desc: 'length',
    unit: 'm',
  },

  '051': {
    name: 'DPT_Value_Mass',
    desc: 'mass',
    unit: 'kg',
  },

  '056': {
    name: 'DPT_Value_Power',
    desc: 'power',
    unit: 'W',
  },

  '065': {
    name: 'DPT_Value_Speed',
    desc: 'speed',
    unit: 'm/s',
  },

  '066': {
    name: 'DPT_Value_Stress',
    desc: 'stress',
    unit: 'Pa',
  },

  '067': {
    name: 'DPT_Value_Surface_Tension',
    desc: 'surface tension',
    unit: '1/Nm',
  },

  '068': {
    name: 'DPT_Value_Common_Temperature',
    desc: 'temperature, common',
    unit: '°C',
  },

  '069': {
    name: 'DPT_Value_Absolute_Temperature',
    desc: 'temperature (absolute)',
    unit: 'K',
  },

  '070': {
    name: 'DPT_Value_TemperatureDifference',
    desc: 'temperature difference',
    unit: 'K',
  },

  '078': {
    name: 'DPT_Value_Weight',
    desc: 'weight',
    unit: 'N',
  },

  '079': {
    name: 'DPT_Value_Work',
    desc: 'work',
    unit: 'J',
  },
};