Reading Kaifa MB310H4BNL

[rweijnen]

I'm trying to read data from a Kaifa MB310H4BNL in The Netherlands.
I am using this script:

>D
>B
=>sensor53 r
>M 1
+1,3,o,0,300,Kaifa,1,20,2F3F210D0A,063030300D0A
1,1.8.1(@1,E1,kWh,Tariff_1,1
1,1.8.2(@1,E2,kWh,Tariff_2,1
1,2.8.0(@1,E3,kWh,Total_export,1
1,2.8.1(@1,E4,kWh,Total_export,1
1,2.8.2(@1,E5,kWh,Total_export,1
#

When sending /?! (2F3F210D0A) meter responds with /KFM5\2Kaifa MA309M. Good this means we have communication!

KFM = Kaifa Metering
5 = baudrate 9600
2 = mode (send data continously without needing to resend /?!, not sure about this but read this in protocol specification)

I tried the script to switch baud mode but not getting valid output with it.

So continueing at 300 I do get output:

However I have 2 issues:

1. random control characters like are in the output
2. the script seems to restart sending /?! before it has received all data.

As a result, the output is unreliable.

If I change +1,3,o,0,300,Kaifa,1,20,2F3F210D0A,063030300D0A to a longer value e.g. +1,3,o,0,300,Kaifa,1,50,2F3F210D0A,063030300D0A I don't get any output as it's taking to long to send the

I also attempted to switch the baudrate with this script:

>D
res=0  
scnt=0    
;For this Example in the >F section  
>F
;count 100ms   
scnt+=1  
switch scnt  
case 6  
;set sml driver to 300 baud and send /?! as HEX to trigger the Meter   
res=sml(1 0 300)  
res=sml(1 1 "2F3F210D0A")  
;1800ms later \> Send ACK and ask for switching to 9600 baud  
case 18  
res=sml(1 1 "063035300D0A")  
;2000ms later \> Switching sml driver to 9600 baud    
case 20  
res=sml(1 0 9600)  ;Restart sequence after 50x100ms    
case 50  
; 5000ms later \> restart sequence    
scnt=0  
ends        
>M 1
+1,3,o,0,9600,Kaifa,1,600
1,1.8.1(@1,E1,kWh,Tariff_1,1
1,1.8.2(@1,E2,kWh,Tariff_2,1
1,2.8.0(@1,E3,kWh,Total_export,1
1,2.8.1(@1,E4,kWh,Total_export,1
1,2.8.2(@1,E5,kWh,Total_export,1
#

But then I get this output:

Any ideas or tips appreciated!

[rweijnen]

Not fully there yet but if I enter from the Web console: SerialConfig 8E1

Then by starting at 300 baud and switching to 9600 I can get output with Sensor53 d1

>D
res=0  
scnt=0    
;For this Example in the >F section  
>F
;count 100ms   
scnt+=1  
switch scnt  
case 6  
;set sml driver to 300 baud and send /?! as HEX to trigger the Meter   
res=sml(1 0 300)  
res=sml(1 1 "2F3F210D0A")  
;1800ms later \> Send ACK and ask for switching to 9600 baud  
case 18  
res=sml(1 1 "063035300D0A")  
;2000ms later \> Switching sml driver to 9600 baud    
case 20  
res=sml(1 0 9600)  ;Restart sequence after 50x100ms    
case 500  
; 5000ms later \> restart sequence    
scnt=0  
ends        
>M 1
+1,3,o8E1,0,9600,Kaifa,1,600
1,1.8.1(@1,E1,kWh,Tariff_1,1
1,1.8.2(@1,E2,kWh,Tariff_2,1
1,2.8.0(@1,E3,kWh,Total_export,1
1,2.8.1(@1,E4,kWh,Total_export,1
1,2.8.2(@1,E5,kWh,Total_export,1
#

Output:

Challenge is that my meter has 300:7E1 for the initial message and 9600:8E1 and I've not found a way to make Tasmota switch. If you look at the output above the first identification string is now a bit garbled

[rweijnen]

I'm making some progress but there's something that I don't understand. If I look at the examples in the documentation it says:

With a few meters, it is necessary to request the meter to send data using a specific character string. This string has to be sent at a very low baud rate (300Baud). If you reply the meter with an acknowledge and ask the it for a new baud rate of 9600 baud, the baud rate of the SML driver has to be change

The sample script is as follows:

>D
res=0  
scnt=0    
;For this Example in the >F section  
>F
;count 100ms   
scnt+=1  
switch scnt  
case 6  
;set sml driver to 300 baud and send /?! as HEX to trigger the Meter   
res=sml(1 0 300)  
res=sml(1 1 "2F3F210D0A")  
;1800ms later \> Send ACK and ask for switching to 9600 baud  
case 18  
res=sml(1 1 "063035300D0A")  
;2000ms later \> Switching sml driver to 9600 baud    
case 20  
res=sml(1 0 9600)   
;Restart sequence after 50x100ms    
case 50  
; 5000ms later \> restart sequence    
scnt=0  
ends        
>M 1
+1,3,o,0,9600, ,1  
;...etc. 

But this script lacks setting up the sensor which normally happens in BOOT:
``

B
=>sensor53 r
``

although some examples use:

>B
   -> sensor 5r r

Workaround:
Start with this script:

>D
>B
=>sensor53 r
>M 1
+1,3,o,0,300,Kaifa,1,20,2F3F210D0A,063030300D0A
1,=so2,2
1,1.8.0(@1,1.8.0 Energy In Total,kWh,Energy_In_T,1
1,1.8.1(@1,1.8.1 Energy In T1,kWh,Energy_In_T1,1
1,1.8.2(@1,1.8.2 Energy In T2,kWh,Energy_In_T2,1
1,2.8.0(@1,2.8.0 Energy Out Total,kWh,Energy_Out_T,1
1,2.8.1(@1,2.8.1 Energy Out T1,kWh,Energy_Out_T1,1
1,2.8.2(@1,2.8.2 Energy Out T2,kWh,Energy_Out_T2,1
#

Then change to this script:

>D
res=0
scnt=0
;For this Example in the >F section

>F
;count 100ms
scnt+=1
switch scnt
case 6
;set sml driver to 300 baud and send /?! as HEX to trigger the Meter
res=sml(1 0 300) 
res=sml(1 1 "2F3F210D0A")

;1800ms later \> Send ACK and ask for switching to 9600 baud
case 18
res=sml(1 1 "063035300D0A")

;2000ms later \> Switching sml driver to 9600 baud
case 20
res=sml(1 0 9600)

;Restart sequence after 50x100ms    
case 50  
; 5000ms later \> restart sequence    
scnt=0  
ends

>M 1
+1,3,o8E1,0,9600,Kaifa,1,600
1,=so2,2
1,1.8.0(@1,1.8.0 Energy In Total,kWh,Energy_In_T,1
1,1.8.1(@1,1.8.1 Energy In T1,kWh,Energy_In_T1,1
1,1.8.2(@1,1.8.2 Energy In T2,kWh,Energy_In_T2,1
1,2.8.0(@1,2.8.0 Energy Out Total,kWh,Energy_Out_T,1
1,2.8.1(@1,2.8.1 Energy Out T1,kWh,Energy_Out_T1,1
1,2.8.2(@1,2.8.2 Energy Out T2,kWh,Energy_Out_T2,1
#

the >M section is never read from the 2nd, it continues to use the one from 1st.

Questions:
What's the difference between -> and => in the >B section with Sensor53?

How to add Sensor53 r to the 2nd script (so I don't have to use the first) because if I add it I get a duplicate GPIO defined error.

[rweijnen]

Well, seems like I finally figured it out:
using +1,3,o8E1,0,9600,Kaifa,1,600 is what's causing the pin conflict message (the o8E1 part).

So set serialconfig: SerialConfig 8E1 then this works for me:

>D
res=0
scnt=0
>B
->sensor53 r
;For this Example in the >F section

>F
;count 100ms
scnt+=1
switch scnt
case 6
;set sml driver to 300 baud and send /?! as HEX to trigger the Meter
res=sml(1 0 300) 
res=sml(1 1 "2F3F210D0A")

;1800ms later \> Send ACK and ask for switching to 9600 baud
case 18
res=sml(1 1 "063035300D0A")

;2000ms later \> Switching sml driver to 9600 baud
case 20
res=sml(1 0 9600)

;Restart sequence after 50x100ms    
case 250  
; 5000ms later \> restart sequence    
scnt=0  
ends

>M 1
+1,3,o,0,9600,Kaifa,1,600
1,=so2,2
1,1.8.0(@1,1.8.0 Energy In Total,kWh,Energy_In_T,1
1,1.8.1(@1,1.8.1 Energy In T1,kWh,Energy_In_T1,1
1,1.8.2(@1,1.8.2 Energy In T2,kWh,Energy_In_T2,1
1,2.8.0(@1,2.8.0 Energy Out Total,kWh,Energy_Out_T,1
1,2.8.1(@1,2.8.1 Energy Out T1,kWh,Energy_Out_T1,1
1,2.8.2(@1,2.8.2 Energy Out T2,kWh,Energy_Out_T2,1
#

Now going to check if it's stable when running longer time.