Hi Wallac!
Please use the following communication settings: 9600,8N1
9600 baud, 8 bits, Parity: none, Stop bits 1
After turn on the MODBUS module in the heatpump configuration the Nibe begins with sending data.
I find out the following information. The Nibe telegram looks like this:
5C always 5C (maybe the address of the Nibe?)
00 always 00
20 Destination address (20 = MODBUS)
68 Command?
50 Length
... Data
D2 Checksum (XOR: data + cmd + len)
I get the following telegram data when turn on the MODBUS settings:
It begins with the following block:
5C 00 20 6B 00 4B
5C 00 20 6B 00 4B
5C 00 20 6B 00 4B
5C 00 20 69 00 49
5C 00 20 69 00 49
5C 00 20 69 00 49
The next three telegrams contains data from the heatpump (including 20 fix parameters):
5C 00 20 68 50
89 9C 00 00 40073 EB100-BEx Energy [kW]
44 9C 48 00 40004 EB100-BT1 Outdoor temp S1 [ºC] 7,2
43 9C 00 00 40003 EB100-BT1 Outdoor temp S2 [ºC]
42 9C 00 00 40002 EB100-BT1 Outdoor temp S3 [ºC]
41 9C 00 00 40001 EB100-BT1 Outdoor temp S4 [ºC]
52 9C 42 01 40018 EB100-BT14 Hot gas temp [ºC] 32,2
97 9C 00 00 40087 EB100-BT14 Hot gas temp [ºC]
48 9C F2 00 40008 EB100-BT2 Supply temp S1 [ºC] 24,2
87 9C 00 80 40071 EB100-BT25 external supply temp [°C] ?
4C 9C EE 00 40012 EB100-BT3 Return temp S1 [ºC] 23,8
61 9C 00 80 40033 EB100-BT50 Room Temp S1 [ºC] ?
4E 9C EA 01 40014 EB100-BT6 Hot Water load [ºC] 49,0
4D 9C 01 02 40013 EB100-BT7 Hot Water top [ºC] 51,3
FF FF 00 00
FF FF 00 00
FF FF 00 00
FF FF 00 00
FF FF 00 00
FF FF 00 00
FF FF 00 00 D2
This is also described in the manual document of the MODBUS 40.
See ->
http://www.nibeonline.com/pdf/031725-2.pdfNext next block is the following:
5C 00 20 EE 00 CE
5C 00 20 EE 00 CE
5C 00 20 EE 00 CE
Then it sends the beginning block again (6 telegrams):
5C 00 20 6B 00 4B
...
The next telegram contains the version and product info (three times):
5C 00 20 6D 13 01 06 E8 46 31 32 34 35 2D 36 20 45 2C 20 50 43 20 44 45 B5
13 len
01 ?
06 E8 Version 1768
... Product F1245-6 E, PC DE
b5 Checksum
Then the last block again (three times):
5C 00 20 EE 00 CE
After this the heatpump goes into the alarm mode. :-(
I think the MODBUS module sends a responds to the Nibe. I hope you can
me to find out the response telegram from the MODBUS. And any other commands...
Best regargs
Thorsten