SOREL CAN BUS Interface (SCBI)

[javier6d2]

Sorel is a manufacturer of difference controllers for heating and solar systems that use CAN Bus protocol

It would be possible to adapt this driver (xsns_87_mcp2515.ino) so the Sorela library showed bellow could be used to translate Sorel CAN Bus messages?

Sorela library

Kind regards

[gemu2015]

the sml driver supports CAN reading and writing on an ESP32 native can interface. there is an example in the docs
forget about the mcp2515, it is simply too slow.

[javier6d2]

So, I have built a tasmota32 firmware with smart meter interface feature and made the following set-up:

ESP32 + CAN transceiver + Sorel controller

Configuration module tasmota is: GPIO14(CLK), GPIO13(MOSI) and GPIO12(MISO)

Scripting to get the values from the solar controller overwhelmed me, should be something like:

`>D

B
=>sensor53 r
M 1
; Sorel
+1,15,C,0,3203,Sorel

#`

I found also this script for the same solar controller. May be it help to get the reads. I appreciate any light.

[gemu2015]

You need only a can transceiver, since the esp32 handles the canbus internally
https://www.ebay.de/itm/263690841938?chn=ps&_ul=DE&norover=1&mkevt=1&mkrid=707-134425-41852-0&mkcid=2&mkscid=101&itemid=263690841938&targetid=1404115578853&device=c&mktype=pla&googleloc=9044703&poi=&campaignid=17935704717&mkgroupid=139162549385&rlsatarget=pla-1404115578853&abcId=9301059&merchantid=138392580&gclid=EAIaIQobChMIxZn1263-gwMVVZtoCR2fgQ47EAQYAiABEgKenPD_BwE
you then specify the receive and transmit pins in sml descriptor
I will have a look at the script you provided and give some hints when you have the hardware ready

[javier6d2]

Thank you. I have already purchased the item. I'll come back when I have the correct hardware setup.

[javier6d2]

Hi gemu,

I have already received the can transceiver, I have tried the following script and executed in the console: sensor53 d1, without success. I don´t receive any telegram in the console.

>D
>B
=>sensor53 r
>M 1
; SOREL LTDC
; params -> 04 = baudrate 250kb + number of receive buffers * 100
+1,3,C,0,3204,CAN,1,5
1,1081407f0801800000UUuuUUuu@1024,Temp S1,C,tmpS1,1
; I don´t know which is the correct addresse
#

[gemu2015]

you must compile with additional option
#define USE_SML_CANBUS
if your Sorel controller emits telegrams without request you should see them in dump mode

[javier6d2]

Thank you. Now I can read the telegrams in the console :

20:04:38.769 MQT: stat/tasmota_4DCF00/RESULT = {"Time":"2024-02-19T20:04:38","SML":{"CMD":"dump: 1"}}
20:05:23.183 : 01042480: 080900000000000000
20:05:23.185 : 10012480: 05000180ffff
20:05:23.186 : 09042480: 08005265696ec29c63
20:05:23.186 : 10032480: 025331
20:05:23.187 : 1008000b: 0824007c0000000018
20:05:23.199 : 10012480: 05000180ffff
20:05:23.200 : 10082480: 030a0500
20:05:23.200 : 09042480: 03fe696f

[javier6d2]

How I can define the Meter Metrics: <M>,<decoder>@<scale><offs>,<label>,<UoM>,<var>,<precision> to get the values in the console?. I have the following sensor temperature value in Sorel controler: S1=123

I get the following dump in the console:

16:40:00.966 : 00012485: 00
16:40:07.657 : 10012480: 0500ce040000
16:40:10.964 : 10012485: 0101
16:40:10.966 : 00012485: 00

I think that line: 16:40:07.657 : 10012480: 0500ce040000 means (HEX to decimal) ce = 206, 04=4 then 206 + 4*256=1233, then S1=1233/10=123ºC

I apreciate any help

[javier6d2]

16:48:18.100 : 10012480: 050208020000 means (HEX to decimal) 08 = 8, 02=2 then 08 + 2x256= 520, then S3=520/10=52ºC
16:52:50.301 : 10012480: 05034e020000 means (HEX to decimal) 4e = 78, 02=2 then 78+ 2x256= 590, then S4=590/10=59ºC

[gemu2015]

normally the specs of your meter should say how the telegrams are composed:
10012480 is the ID of the telegram, the 05 is length of payload.
now you have 5 bytes payload:

in case your payload is a a word with 0802 (08020000)
you define a decoder with e.g unsigned word (defined with UUuu)

1,100124800500uuUU@10,Temp S1,C,tmpS1,1

see the docs about the decoder options
you should know the byte order and format of your payload

10 is the scaling factor from your sorel docs

[javier6d2]

Many many thanks the explanation and to point me in the right direction. I will continue watching the telegrams to extract more information from the Sorel controller. At this moment I have the temp values:

1,100124800500uuUU@10,Temp S1,ºC,S1,1
1,100124800501uuUU@10,Temp S2,ºC,S2,1
1,100124800502uuUU@10,Temp S3,ºC,S3,1
1,100124800503uuUU@10,Temp S4,ºC,S4,1 

[arnwik]

@gemu2015
You mentioned that 10 is the scaling factor from the sorel docs. Where did you find that documentation?
Mine look something like this, and I have no clue which is sensor 1,2,3 and which is the relay for the pump etc:

Timestamp: 1729976452.338099 ID: 0001d085 X Rx DL: 0 Channel: can0
Timestamp: 1729976453.214224 ID: 1007d080 X Rx DL: 8 25 00 01 00 00 00 00 00 Channel: can0
Timestamp: 1729976453.314203 ID: 1007d080 X Rx DL: 8 25 01 00 00 00 00 00 00 Channel: can0
Timestamp: 1729976453.414220 ID: 1007d080 X Rx DL: 8 25 02 01 00 00 00 00 00 Channel: can0
Timestamp: 1729976453.814187 ID: 1007d080 X Rx DL: 8 40 00 01 00 00 00 00 00 Channel: can0
Timestamp: 1729976453.914211 ID: 1007d080 X Rx DL: 8 40 01 00 00 00 00 00 00 Channel: can0
Timestamp: 1729976454.014234 ID: 1007d080 X Rx DL: 8 40 02 01 00 00 00 00 00 Channel: can0
Timestamp: 1729976456.214277 ID: 1007d080 X Rx DL: 8 60 00 11 00 00 00 00 00 Channel: can0
Timestamp: 1729976456.314253 ID: 1007d080 X Rx DL: 8 60 01 00 00 00 00 00 00 Channel: can0
Timestamp: 1729976456.414254 ID: 1007d080 X Rx DL: 8 60 02 11 00 00 00 00 00 Channel: can0
Timestamp: 1729976459.814328 ID: 1007d080 X Rx DL: 8 80 00 b6 02 00 00 00 00 Channel: can0
Timestamp: 1729976459.914350 ID: 1007d080 X Rx DL: 8 80 01 00 00 00 00 00 00 Channel: can0
Timestamp: 1729976460.014339 ID: 1007d080 X Rx DL: 8 80 02 b6 02 00 00 00 00 Channel: can0
Timestamp: 1729976461.914407 ID: 1007d080 X Rx DL: 8 c0 00 00 00 00 00 00 00 Channel: can0
Timestamp: 1729976462.014358 ID: 1007d080 X Rx DL: 8 e0 00 03 00 0f 00 00 00 Channel: can0
Timestamp: 1729976462.338054 ID: 1001d085 X Rx DL: 1 01 Channel: can0
Timestamp: 1729976462.338326 ID: 0001d085 X Rx DL: 0 Channel: can0

[gemu2015]

i do not have any Sorel controller. i simply got this factor from the script referenced in a post above (https://github.com/ddimension/can-ltdc-logger/blob/master/can-ltdc-logger.c)

[javier6d2]

Summary:

Compile firmware with #define USE_SML_CANBUS. Use a proper CAN transceiver. You need a 120Ohms resistor in the second CAN port of the controller, otherwise ESP32 device will not decode anything on the bus, the baudrate is 250 KBITS.

If decoding works you should see a stream of CAN telegrams with regular updates at least every 20sec.

Script:

>D

>B
=>sensor53 r

>M 1
; SOREL LTDC
; params -> 04 = baudrate 250kb + number of receive buffers * 100
+1,3,C,0,3204,CAN,1,5
1,100124800500uuUU@10,Temp S1,ºC,S1,0
1,100124800501uuUU@10,Temp S2,ºC,S2,0
1,100124800502uuUU@10,Temp S3,ºC,S3,0
1,100124800503uuUU@10,Temp S4,ºC,S4,0
1,[email protected],Relay R1,,R1,0
1,[email protected],Relay R2,,R2,0
1,[email protected],Relay R3,,R3,0
#

[WillySteenbergen]

Hi, Do you have the compiled firmware for this, and the wire diagram?