fhem und monitoring Stiebel Eltron LWZ 30X // Tecalor THZ 30X (Wärmepumpe)

[immi]

Hallo zusammen
einfach so,
Ich habe ein Weihnachtsprojekt-2012: porting.

Die protokolle sind bekannt
http://robert.penz.name/heat-pump-lwz/
http://heatpumpmonitor.penz.name/heatpumpmonitorwiki/


immi

[immi]

Dear all

I found some time and I started implementing a new module for fhem
Thanks Pah, I inspired myself to your NT5000.pm and thanks Rudolf I copied a lot from your TCM.pm

fhem meets tecalor/StiebelEltron heat pump THZ.pm

No official protocol description is available from Tecalor/StiebelEltron: I started here:
viktor-volmut said on 2010-02-14:

https://answers.launchpad.net/heatpumpmonitor/+question/100347

Step 1)  hardware setup --> easy
the heat-pump THZ304 is connected to a serial interface RS-232 as described by Robert
http://robert.penz.name/heat-pump-lwz/
The serial is connected to an old fritzbox with a usb2serial adapter: I ordered the following material from an onlineshop.

Menge		Description	Price
1 Stück	971791	USB 2.0 Seriell Adapter USB 2.0 Stecker A / D-SUB-Stecker 9pol.	€ 14,95
1 Stück	715968	D-SUB Flip Top Gehäuse Pole: 9 A-FT 09 Assmann WSW	€ 0,93
1 Stück	743763	D-SUB, stehend Pole: 9 Buchse, gerade Löten A-DF 09 PP Assmann	€ 0,91
1 Stück	749745	Universal-MATE-N-LOK Steckverbinder, Steckergehäuse zur Verwendung mit Crimpkontakten Nennstrom=15 A Pole=1 x 3 350766-1	€ 0,38
8 Meter	600611	Telefoninnenkabel J-Y(ST)Y 2 x 2 x 0.8 mm Grau Meterware	€ 9,52
3 Stück	749901	Crimpkontakte für Universal-MATE-N-LOK Nennstrom=15 A Pole=1 926894-1 TE Connectivity	€ 0,51

Please check the serial speed: my THZ304 works at 115200; several older models have been reported to work at 57600 or even slower.

Just try the right speed for you.


Step 2) bridge to fhem server over ip
(not needed if you connect the serial interface directly).
I redirect the USBport with the serial adapter of the freetz to my NAS (QNAP119) where FHEM is running.
Both USBIP and SER2NET are widely available (e.g in Freetz)
USBIP provides remote access to a usb port from another linux computer. USBIP was a complete overkill for my intention so I decided for SER2NET, which is more stable and does not require any driver on the fhem server.


Step 3) THZ.pm
define Mythz THZ fritz.box:2003 # for local serial interface use "/dev/ttyUSB0@115200"
define FileLog_Mythz FileLog /Users/simone/dev/workspace/thz/log/Mythz-%Y.log Mythz
attr FileLog_Mythz logtype thz:plot, text


major issues// to do

• clean up
• understand and fix how the module interacts with filelog (in sub THZ_Get)
• understand and fix how the module interprets the messages from the heatpump (THZ_Parse)
• catch the answer from the pump in a more elegant way
• implement other read activities and make THZ.pm compatible with different THZ/LWZ heatpumps
• implement write activities (changing parameters on in the heatpump)
• make more elegant the polling at regular intervals to obtain current reading

Now, the THZ module is very buggy but works.
I am using perl for the first time and I am just writing code late in the night when children are in bed.
It will take time to to reach a beta status but I will not give up.
The help of FHEM experts is clearly appreciated. In the case an angel finds time to support, it would make very sense to upload THZ.pm to http://fhem.svn.sourceforge.net

IMMI