code: function _readFC16(data, next) {
      var dataAddress = data.readUInt16BE(2);
      var length = data.readUInt16BE(4);
  
      if (next)
          next(null, { "address": dataAddress, "length": length });
  }
docs: Parse the data for a Modbus -
  Preset Multiple Registers (FC=15, 16)
  
  @param {Buffer} data the data buffer to parse.
  @param {Function} next the function to call next.