meterVal_t Struct Reference

One smart meter's readings. More...

#include <sweetHome.h>

Data Fields
int	err
	Modbus error.
int	hourOffs
	Actual offset in hours of local time zone.
uint16_t	ms
	Absolute time's miliseconds.
uint16_t	msDurRead
	Duration of last Modbus operation, probably read, in ms.
float	pSum
	Power sum [W] over all (three) phases.
char	rTmTxt [34]
	Local time as text.
uint32_t	stmpS
	Absolute time stamp for the current value.
float	vals [18]
	Compact and re-sorted meter readings.

Detailed Description

One smart meter's readings.

The (first) four timing values are the start of reading; to have the end add .msDurRead.

Field Documentation

stmpS

uint32_t stmpS

Absolute time stamp for the current value.

This value and its supplements meterVal_t.ms, meterVal_t.hourOffs and meterVal_t.rTmTxt are updated at every Modbus read.

ms

uint16_t ms

Absolute time's miliseconds.

This is a ms supplement to meterVal_t.stmpS.

hourOffs

int hourOffs

Actual offset in hours of local time zone.

A positive value means east of UTC (Greenwich).

rTmTxt

char rTmTxt[34]

Local time as text.

The text's lenght is 32. See also meterVal_t::stmpS, meterVal_t::ms

err

int err

Modbus error.

0 is OK; -99 means not yet initialised. Otherwise err - MODBUS_ENOBASE is the last operations modbus error as defined by StǸphane Raimbault.

msDurRead

uint16_t msDurRead

Duration of last Modbus operation, probably read, in ms.

A value well below 500ms is significant for a successful read. Significantly above means timeout / error.

vals

float vals[18]

Compact and re-sorted meter readings.

These values are to be updated on every error-free meter reading (by Modbus, RS485 e.g.). Each pair of 16bit-Modbus-registers holds a 32bit IEEE754 floating point number, i.e. a C float.
The values are:

indexes: values          : registers : unit
0..2   : U (L1, L2, L3)  :  1.. 6    :  /V
3..5   : I (L1, L2, L3)  :  7..12    :  /A
6..8   : P (L1, L2, L3)  : 13..18    :  /W
9      : f               : 71..72    :  /Hz
10, 11 : ::Wimp ::Wexp       : 73..76    :  /Wh
12..14 : phi(L1, L2, L3) : 37..42    : /deg Celsius
15..17 : reserve (not used in R.115++)  

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The documentation for this struct was generated from the following file:

• include/sweetHome.h