Negative offset in FHT8v not supported in FHEM?

[Guest]

Originally posted by: <email address deleted>

Hi,

I have 6 FHT8V's in my living room which are controlled by one FHT80b
(which is controlled by FHEM).

As in the morning some heaters/radiators stay cold, while others are
really hot, I need the 'offset' funtion to adjust the valve openings.

When I use positive offset settings in the FHT80b, FHEM also reports
positive offset percentages, e.g.

Offset               Offset
on                     reported
FHT80b            in FHEM
5              =>     2%
10            =>     4%
15            =>     6%
20            =>     8%

However, it is also possible to use a NEGATIVE offset on the FHT80b.
Then, if I use -5 on the FHT80b, FHEM reports 52%. And if I use -3 it
reports 51%.

Maybe FHEM misses or mis-interprets a bit somewhere which is used to
report 'negative'?

Anyway, I am not even 100% sure if the negative and positive offset's
on the FHT80b and FHT8v actually even work as they should, but that's
a different story. Any experience with either of those anyone?

Regards, Jan.

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[rudolfkoenig]

                                                   

Hello Jan,

I have no experience with actuator offsets, so what fhem reports is probably
wrong. For my understanding:
- do you refer to the actuator1 ... actuator8 messages?
- can you send us some raw messages together with the interpreted ones,
  so that I see exactly the problem? And please tell what offset an actuator
  is supposed to have.
- is it true, that the FHT is sending either an actuator message or an
  actuatorX message every 115+x seconds?

Right now fhem divides actuator values by 2.55 (100% == 255).

Regards,
  Rudi.

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[Guest]

Originally posted by: <email address deleted>

Hi Jan, Rudi,

I suppose the value happens to be signed 8bit.
[127 - (-5%)] / 2.55 == 51,76%.... which is rounded up by FHEM to 52%
[127 - (-3%)] / 2.55 == 50,98%1 == 51%

Ciao, Arno

Am 7. März 2011 14:22 schrieb Rudolf Koenig :
> Hello Jan,
>
> I have no experience with actuator offsets, so what fhem reports is probably
> wrong. For my understanding:
> - do you refer to the actuator1 ... actuator8 messages?
> - can you send us some raw messages together with the interpreted ones,
>  so that I see exactly the problem? And please tell what offset an actuator
>  is supposed to have.
> - is it true, that the FHT is sending either an actuator message or an
>  actuatorX message every 115+x seconds?
>
> Right now fhem divides actuator values by 2.55 (100% == 255).
>
> Regards,
>  Rudi.
>
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>
>



--
Arno Willig

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[Guest]

Originally posted by: <email address deleted>

Hi Rudolf

> - do you refer to the actuator1 ... actuator8 messages?

Yes.


> - can you send us some raw messages together with the interpreted ones,
>   so that I see exactly the problem? And please tell what offset an actuator
>   is supposed to have.

This is output for actuator1 which is configured on the FHT80b with a
offset of '4':

2011.03.07 23:12:03 4: FHZ/RAW: 810c04 (Unparsed: )
2011.03.07 23:12:03 4: FHZ/RAW: 700909a001543c01002804 (Unparsed:
810c04)
2011.03.07 23:12:03 1: FHT woonkamer actuator1: offset: 2%

2011.03.07 23:14:00 4: FHZ/RAW: 810c (Unparsed: )
2011.03.07 23:14:00 4: FHZ/RAW: 04700909a001543c01002804 (Unparsed:
810c)
2011.03.07 23:14:00 1: FHT woonkamer actuator1: offset: 2%

So weirdly enough everything you set on the FHT80b is shown is half
that value by FHEM.


This is output for actuator5 which is configured on the FHT80b with a
offset of '-5':

2011.03.07 23:15:57 4: FHZ/RAW: 810c04f509 (Unparsed: )
2011.03.07 23:15:57 4: FHZ/RAW: 09a001543c05002885 (Unparsed:
810c04f509)
2011.03.07 23:15:57 1: FHT woonkamer actuator5: offset: 52%

2011.03.07 23:17:54 4: FHZ/RAW: 810c047509 (Unparsed: )
2011.03.07 23:17:54 4: FHZ/RAW: 09a001543c0500a885 (Unparsed:
810c047509)
2011.03.07 23:17:54 1: FHT woonkamer actuator5: offset: 52%

2011.03.07 23:19:52 4: FHZ/RAW: 810c04750909a001543c0500a885
(Unparsed: )
2011.03.07 23:19:52 1: FHT woonkamer actuator5: offset: 52%

2011.03.07 23:21:48 2: FS20 warmtepomp on
2011.03.07 23:21:48 4: FHZ/RAW: 810c04750909a001543c0500a885
(Unparsed: )
2011.03.07 23:21:48 1: FHT woonkamer actuator5: offset: 52%

2011.03.07 23:23:45 4: FHZ/RAW: 810c047509 (Unparsed: )
2011.03.07 23:23:45 4: FHZ/RAW: 09a001543c0500a885 (Unparsed:
810c047509)
2011.03.07 23:23:45 1: FHT woonkamer actuator5: offset: 52%

2011.03.07 23:25:42 4: FHZ/RAW: 810c04750909a001 (Unparsed: )
2011.03.07 23:25:42 4: FHZ/RAW: 543c0500a885 (Unparsed:
810c04750909a001)
2011.03.07 23:25:42 1: FHT woonkamer actuator5: offset: 52%

That should have been -5%, or at least, consistent with positive
offsets half of that so -2 or  -3.


> - is it true, that the FHT is sending either an actuator message or an
>   actuatorX message every 115+x seconds?

Yes, normally only an actuator message at that interval (I see that
with all 7 FHT80b's I use),
and when you change a 'offset' setting it stops sending the normal
actuator message but starts
sending a "actuatorX: offset: Y%" message at the same interval. If you
change the offset setting
for a different actuator, it's starting to send actuatorX messages for
that one, and stops sending
them for the previous one.
In the morning when heating was required again, it stopped sending
those actuatorX messages
at all, and turned back to normal actuator messages.
But the time interval always remains the same.


> Right now fhem divides actuator values by 2.55 (100% == 255).

It seems that Arno Willig's conclusion is consistent with my
observations. That could explain that
negative values are not shown right, and that positive values are
shown at half their actual value...

Regards, Jan.

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[rudolfkoenig]

                                                   

> So weirdly enough everything you set on the FHT80b is shown is half
> that value by FHEM.

Not so weird: the computation is int(/2.55+0.5) . This is correct for
normal actuator messages, but (obviously) wrong for offset messages.  Can you
tell me what is shown in the actuator display after an offset was transmitted?


> In the morning when heating was required again, it stopped sending those
> actuatorX messages at all, and turned back to normal actuator messages.

What is displayed in this case by the actuator? I assume it is the "normal"
value + offset.

My current theory is: the FHT80b sends the offset until the absolute/current
value has to be changed. From now on it sends only the absolute value, and
forgets about the offsets, the offset has to be remembered by the actuator.

Can you please confirm?

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[Guest]

Originally posted by: <email address deleted>

Hi Rudolf,

> Can you
> tell me what is shown in the actuator display after an offset was transmitted?

The value on the display of the actuator is the same on all actuators,
and is
consistent with the normal actuator value reported in FHEM. So the
offset does
NOT influence the values displayed on the actuator.

When you change an offset value, the actuator will fully open, and
then fully
close again.

As far as I know it simply changes it's base setting (opening) at that
point,
and from then on uses the normaly actuator opening percentages again,
relatively to the initial configured base setting.

So it does not apply the offset each time heating is required, it only
applies
the offset once, while resetting itself.

So normally during initialisation it determines howmuch turning is
required to fully
open, and howmuch is required to fully close and uses that info in the
future to open
for 'X%' when requested.

Now during that process it uses the offset value to slightly adept
those initial settings.


> > In the morning when heating was required again, it stopped sending those
> > actuatorX messages at all, and turned back to normal actuator messages.
>
> What is displayed in this case by the actuator? I assume it is the "normal"
> value + offset.

No, just the normal value.


> My current theory is: the FHT80b sends the offset until the absolute/current
> value has to be changed. From now on it sends only the absolute value, and
> forgets about the offsets, the offset has to be remembered by the actuator.

I don't think so.

If I change the offset of 5 actuators, it will change each 5 of them
one-by-one
in a +/- 2 minute interval (so only one at a time in one time-window),
and odly
enough in reverse order, so the newest change first, and the oldest
change last.
And then it continues to report the offset value of the actuator that
was changed
last. I think that is simply a bug: it should report each change
offset only once.

The actual change within the actuator is made only once (I guess)
during reset.
Why else would it fully open and fully close when you change the
offset?

It would be great if  FHEM could be changed to support the signed int
values for
the offset

Regards, Jan.

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[rudolfkoenig]

                                                   

Hello Jan,

> It would be great if  FHEM could be changed to support the signed int
> values for the offset

Sorry for the delay, I just wanted to understand the behaviour. I checked in a
new version, but the difference is small:

< elsif($sval =~ m/.8/) { $val = "offset: $fv" }
---
> elsif($sval =~ m/.8/) { $val = "offset: " . ($val>128?(128-$val):$val) }


Other small completely unrelated tidbits:

Added ignoreTypes attribute to autocreate to ignore your neighbours devices:
  attr autocreate ignoreTypes FHT_1234|CUL_HOERMANN.*

Replaced the FHEMBWEB nofork attribute with plotfork, this also reverses the
default behaviour, as it creates problems on devices with limited memory and on
Windows.

Regards,
  Rudi

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[Guest]

Originally posted by: <email address deleted>

Hi Rudolf,

> Sorry for the delay, I just wanted to understand the behaviour. I checked in a
> new version, but the difference is small:
>
> < elsif($sval =~ m/.8/) { $val = "offset: $fv" }
> ---
>
> > elsif($sval =~ m/.8/) { $val = "offset: " . ($val>128?(128-$val):$val) }

That does seem to do the job, when I set offset to -5 on the FHT80b
screen, FHEM reads:

2011-03-11_09:23:36 woonkamer actuator5: offset: -5

and when I change the offset to +3, FHEM reports:

2011-03-11_09:25:33 woonkamer actuator5: offset: 3

And a different one set on +32:

2011-03-11_09:27:30 woonkamer actuator2: offset: 32

Seems to work like a charm now! Thanks!

Regards, Jan.

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