Control the BMS via serial interface #20

syssi · 2021-11-16T15:20:07Z

Follow-up: #19

I am in contact with a JK engineer through WECHAT, but they are hard to extract information ... but he told me that the GPS module
they have is capable of controlling the BMS remotely, as a remote control for robberies, from what I understand that it should be
possible to change parameters through the serial port.

syssi · 2021-11-16T15:23:31Z

@diybateriaslifepo4 We are talking about this value:

https://github.com/syssi/esphome-jk-bms/blob/main/components/jk_modbus/jk_modbus.cpp#L135

If we change the value from 0x03 to 0x02 we simulate a communication between the BMS and a GPS device. It's possible to BMS response differs a bit in this case. In best case the response is the same and commands we issue are executed properly (if the frame source is GPS).

diybateriaslifepo4 · 2021-11-17T07:40:58Z

I am trying to get jk me information about this communication, but they insist that I must use their adapter to rs485 and their documentation for communication by rs485, I do not know if you already have it, how could I send it to you?

syssi · 2021-11-17T08:03:06Z

You could attach the docs here by drag&drop.

diybateriaslifepo4 · 2021-11-17T09:12:55Z

BMS CAN instruction.pdf
BMS 485 instruction.pdf

I see that it is the same information that you have in the readme...

syssi · 2021-11-17T11:17:57Z

The "BMS 485 instruction.pdf" describes the implemented protocol and doesn't contain new details.

ortegafernando · 2021-12-12T10:51:16Z

hi, how to write settings via serial? Thanks

syssi · 2021-12-12T11:06:57Z

This compoent doesn't support write operations right now. It's also unconfirmed it's possible or not.

diybateriaslifepo4 · 2021-12-12T12:07:11Z

in the protocol it says RW

@diybateriaslifepo4 We are talking about this value:

https://github.com/syssi/esphome-jk-bms/blob/main/components/jk_modbus/jk_modbus.cpp#L135

If we change the value from 0x03 to 0x02 we simulate a communication between the BMS and a GPS device. It's possible to BMS response differs a bit in this case. In best case the response is the same and commands we issue are executed properly (if the frame source is GPS).

have you been able to try this? I would do it but I don't have much idea about programming... Thanks for your job

syssi · 2021-12-12T13:07:53Z

I will give it a try but my powerwall isn't assembled at the moment so my feedback / testing will take a few weeks.

diybateriaslifepo4 · 2021-12-12T13:34:36Z

ok, there is no rush, in case you don't know you can turn on the bms with a power supply, with about 40v, only putting the negative in b0 & B- and positive in b+, without cells

SeByDocKy · 2022-02-18T08:54:30Z

Any update for such control ? :) ... .Now my JK BMS runs like a charm thanks your component, I would like to see these switch really working.... would be also amazing :)

diybateriaslifepo4 · 2022-02-18T11:06:11Z

Any update for such control ? :) ... .Now my JK BMS runs like a charm thanks your component, I would like to see these switch really working.... would be also amazing :)

I have tried to do it and it has not worked, I have tried creating an external component, changing the value to bms, bluetooth, gps and computer, and not able to change values in any way
But maybe I haven't done it correctly, let's hope that Sysssi can test it one of these days.

syssi · 2022-02-26T22:08:42Z

The switch entities are now able to send some instructions to the BMS:

[switch:017]: 'jk-bms charging' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AB:00:00:00:00:00:68:00:00:01:6A
[switch:013]: 'jk-bms charging' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AB:01:00:00:00:00:68:00:00:01:6B

[switch:017]: 'jk-bms discharging' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AC:00:00:00:00:00:68:00:00:01:6B
[switch:013]: 'jk-bms discharging' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AC:01:00:00:00:00:68:00:00:01:6C

[switch:017]: 'jk-bms balancing' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:9D:00:00:00:00:00:68:00:00:01:5C
[switch:013]: 'jk-bms balancing' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:9D:01:00:00:00:00:68:00:00:01:5D

[switch:013]: 'jk-bms dedicated charger' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:B3:01:00:00:00:00:68:00:00:01:73
[switch:017]: 'jk-bms dedicated charger' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:B3:00:00:00:00:00:68:00:00:01:72

Is somebody willing to test the new feature?

SeByDocKy · 2022-02-26T22:33:53Z

The switch entities are now able to send some instructions to the BMS:

[switch:017]: 'jk-bms charging' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AB:00:00:00:00:00:68:00:00:01:6A
[switch:013]: 'jk-bms charging' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AB:01:00:00:00:00:68:00:00:01:6B

[switch:017]: 'jk-bms discharging' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AC:00:00:00:00:00:68:00:00:01:6B
[switch:013]: 'jk-bms discharging' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AC:01:00:00:00:00:68:00:00:01:6C

[switch:017]: 'jk-bms balancing' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:9D:00:00:00:00:00:68:00:00:01:5C
[switch:013]: 'jk-bms balancing' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:9D:01:00:00:00:00:68:00:00:01:5D

[switch:013]: 'jk-bms dedicated charger' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:B3:01:00:00:00:00:68:00:00:01:73
[switch:017]: 'jk-bms dedicated charger' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:B3:00:00:00:00:00:68:00:00:01:72

Is somebody willing to test the new feature?

Sure I wil ltest right now

SeByDocKy · 2022-02-26T22:58:09Z

Ok ... seems to not working for me :( .... I can see the OFF command sent ... but the switch is returning to its initial state (ON)

rob-oravec · 2022-02-27T07:54:00Z

Same for me.

SeByDocKy · 2022-02-27T13:08:18Z

I tried whatever the password is entered before or not .... switch control does not work for me...

syssi · 2022-03-01T19:41:42Z

I talked to the seller of my BMS and he told me the serial interface is read only. :-( I fear it is the truth.

SeByDocKy · 2022-03-01T19:50:43Z

I talked to the seller of my BMS and he told me the serial interface is read only. :-( I fear it is the truth.

Damned :(

SeByDocKy · 2022-03-02T12:35:55Z

I just checked the protocol pdf I got, effectively, we car read

R 0 X 84 The current data 2 Hex 10000 (10000-11000) * 0.01 = 10.00), a (discharge)
(10000-9500) *0.01= 5.00A (charging) P r e c i s i o n 1 0 mAunit:0 1 A
Note: C 0:0 x 01 redefines the 0 x 84 current data in 10 mA, with the highest bit being0"1" means "discharge" and "1" means charge
If the discharge is 20 A, the transmitted data is 2000 (0x 07 D0)
If the charge is 20 A, the transmission data is 34768 (0x 87 D0

in Read only :( :( .... what's a pity. Maybe time to change them into binary sensor so ?

syssi · 2022-03-02T12:56:29Z

I cannot follow / I didn't understand. Could you rephrase your statement? :-)

SeByDocKy · 2022-03-02T12:58:43Z

I mean if it's only in read only .... no need to define them in switch but more in binary sensors ?

syssi · 2022-03-02T13:01:37Z

Yes. I will convert the switches into binary sensors soon and yes the sign of the current sensor is inverted for my BMS software/hardware version too. If we are doing breaking changes we can fix/improve this as well.

syssi · 2022-03-02T15:13:23Z

FYI: #50

syssi · 2022-03-02T15:33:55Z

I've converted the switch into binary sensors: #51

diybateriaslifepo4 · 2022-03-02T15:53:46Z

The strange thing is that they told me that the mosfets could be controlled from the gps, and the gps uses the same serial interface...

syssi · 2022-03-02T16:06:14Z

Do you know the exact product (GPS) I've to buy? As soon we have two devices talking to each other the communication can be captured easily. I've captured the traffic between the bluetooth module and the MCU already. I had the hope the same protocol is used here but it looks like this isn't the case: #49

Funny thing: The bluetooth password (123456) isn't passed to the MCU at all. It's used to unlock the bluetooth module but it's not part of the traffic between the bluetooth module and the MCU of the BMS.

diybateriaslifepo4 · 2022-03-02T17:25:48Z

Do you know the exact product (GPS) I've to buy? As soon we have two devices talking to each other the communication can be captured easily. I've captured the traffic between the bluetooth module and the MCU already. I had the hope the same protocol is used here but it looks like this isn't the case: #49

Funny thing: The bluetooth password (123456) isn't passed to the MCU at all. It's used to unlock the bluetooth module but it's not part of the traffic between the bluetooth module and the MCU of the BMS.

tomorrow I ask the distributor, to see if I can ensure the functions of the GPS, I was going to send one pars test, but he told me that not all the functions would work in Spain, because it is designed to work in China

syssi · 2022-03-02T19:21:46Z

I asked my seller (HankzorBMS Store) about connecting an GPS/GSM device and he told me I need a customized version of the BMS.

SeByDocKy · 2022-03-02T19:53:05Z

I asked my seller (HankzorBMS Store) about connecting an GPS/GSM device and he told me I need a customized version of the BMS.

Custom firmware ? or also hardware modified ?

syssi · 2022-03-02T19:57:31Z

In general the seller wants to sell 1000 pieces of a special BMS version. The difference will be the firmware only. I don't think we will receive an alternative/updated firmware ever.

diybateriaslifepo4 · 2022-03-03T16:16:46Z

Do you know the exact product (GPS) I've to buy? As soon we have two devices talking to each other the communication can be captured easily. I've captured the traffic between the bluetooth module and the MCU already. I had the hope the same protocol is used here but it looks like this isn't the case: #49

Funny thing: The bluetooth password (123456) isn't passed to the MCU at all. It's used to unlock the bluetooth module but it's not part of the traffic between the bluetooth module and the MCU of the BMS.

sure enough, my dealer is now telling me that the port is read only, sorry 😭

syssi · 2022-03-03T16:35:00Z

The minimum quantity for customized devices is 100.

SeByDocKy · 2022-03-03T16:37:44Z

The minimum quantity for customized devices is 100.

It's 99 more that I need :) :) ... Any way are the UVP? UVPR, LVP, LVPR writable ? Coz we could fake charging/discharging by this way ?

syssi · 2022-03-03T16:59:04Z

I think UVP, UVPR, LVP and LVPR can be written/controlled via BLE. Whats the goal of faking charging/discharging? I think I didn't get the point.

SeByDocKy · 2022-03-03T17:20:19Z

I think UVP, UVPR, LVP and LVPR can be written/controlled via BLE. Whats the goal of faking charging/discharging? I think I didn't get the point.

By setting UVP=UVPR=LVP=LVPR is disabling charging/discharing de facto

syssi · 2022-03-03T18:24:20Z

No write operations are possible via the serial interface. We have to use BLE to control the device.

rem72 · 2022-03-03T22:08:46Z

Hello Sebastian, will you try to connect the Voltronic inverter to an esp32 that in turn speaks via bluetooth with the jk? Perhaps it's the way to talk between them.

syssi · 2022-04-23T08:48:18Z

I've implemented a BLE verison of this component a few days ago:

https://github.com/syssi/esphome-jk-bms/blob/main/esp32-ble-example.yaml

The switches (charging, discharging, balancer) can be controlled already.

syssi · 2022-04-23T09:12:47Z

I will close this issue because it cannot be solved. I assume we must accept the serial connection is "read-only".

Wiebo · 2022-10-04T13:25:49Z

The switch entities are now able to send some instructions to the BMS:

[switch:017]: 'jk-bms charging' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AB:00:00:00:00:00:68:00:00:01:6A
[switch:013]: 'jk-bms charging' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AB:01:00:00:00:00:68:00:00:01:6B

[switch:017]: 'jk-bms discharging' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AC:00:00:00:00:00:68:00:00:01:6B
[switch:013]: 'jk-bms discharging' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:AC:01:00:00:00:00:68:00:00:01:6C

[switch:017]: 'jk-bms balancing' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:9D:00:00:00:00:00:68:00:00:01:5C
[switch:013]: 'jk-bms balancing' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:9D:01:00:00:00:00:68:00:00:01:5D

[switch:013]: 'jk-bms dedicated charger' Turning ON.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:B3:01:00:00:00:00:68:00:00:01:73
[switch:017]: 'jk-bms dedicated charger' Turning OFF.
[uart_debug:114]: >>> 4E:57:00:14:00:00:00:00:02:02:02:B3:00:00:00:00:00:68:00:00:01:72

Is somebody willing to test the new feature?
The CRC is calculated wrong...

syssi · 2022-10-04T13:31:20Z

@Wiebo Why do you think so? :-)

Wiebo · 2022-10-04T16:15:49Z

The checksum of this line:
4E:57:00:14:00:00:00:00:02:02:02:9D:00:00:00:00:00:68:00:00:01:5C
does not give me a response from the BMS. Also adding the END marker 0x68 gives checksum 0x01 0xC4
So,
4E:57:00:14:00:00:00:00:02:02:02:9D:00:00:00:00:00:68:00:00:01:C4
does give me a response from the BMS.

Still nothing changed though...

syssi · 2022-10-04T16:44:29Z

Thanks for your feedback! Too bad it's not working anyway. Did you try different frame sources (f.e. GPS)?

Wiebo · 2022-10-05T07:43:02Z

Yes, but also looking into command code 0x5, but don't really understand what they mean with that chinglish that's put into the manual...
"Pair code instruction - To modify the parameters, the first command is correct before the change"

If i make any progress i'll post it here. The manual clearly states these registers as R/W, but don't know if it's only for BLE

syssi mentioned this issue Feb 26, 2022

Add BMS controls #44

Merged

syssi closed this as completed Apr 23, 2022

Control the BMS via serial interface #20

Control the BMS via serial interface #20

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