JKBD6A20S10P Software version 11.42, hardware V11.XW UART-TTL not response with command request

[paulsteigel]

Hi All,
I have recently purchased a JKBD6A20S10P and I built an esphome interface using syssi configuration using esp32lolin. However, the JKBMS does not response to querry command via UAR TTL. This happened with my friend version too (11.28 and 11.36, mine is 11.42). I think JK has changed the protocol. Does anyone have fixed this problem?
Please help with thanks.
The response code to the "4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28" command is nothing and make time out happened
Best!

 

[ChrisG]

I’m running the version below without issue. Do you have the pins mapped correctly on your ESP?

Hardware Ver: V11.XW
Software Ver: V11.288

 

[paulsteigel]

I’m running the version below without issue. Do you have the pins mapped correctly on your ESP?

Hardware Ver: V11.XW
Software Ver: V11.288

I did correctly and the same esp worked with all other older versions but surely not working with 11.42 and 11.36. for the 11.28 i need to check the correct photo of the app about box for now (may be a mistake, coz it happened in November 2023.)

 

[braincore]

I'm also not getting a response with V10:

Device: JK-B1A20S15P
Hardware Ver: V10.XW
Software Ver: V10.10

Microcontroller: Raspberry Pi Pico (RP2040)

I've verified with an oscilloscope that the correct TX data is being sent, but nothing comes back. Any suggestions?

 

[upnorthandpersonal]

Check the reply here:

JKBD6A20S10P Software version 11.42, hardware V11.XW UART-TTL not working · Issue #477 · syssi/esphome-jk-bms

Hi All I tested the esp32-example.yaml file with esp32S2 mini Lolin, esp32wroom devkit and JKBD6A20S10P with software version latter than 11.36 (I tested on 2 different JKs, one with Software versi...

github.com

Make sure you set device address to 1 and change uart protocol in the app.

 

[braincore]

Oddly, my app does not show:

- UART1 Protocol No.
- Device Addr

Did hw/sw v10 not have those options?

 

[upnorthandpersonal]

Do you have the latest version of the app? Not sure what HW/SW version it was introduced.

 

[braincore]

I have app version v4.19.7 which according to the iOS app store is the latest. Am I mistaken?

 

[upnorthandpersonal]

I think 4.20.0 is the latest version on Android.
V10 hardware/software might not support these features, but it should work fine with UART. You sure your baud rate/connection (TX to RX)/ etc. is correct?

 

[braincore]

Tried both 115200 and 9600 baud rates. Also verified the baud rates via oscilloscope.

Now that I think about it, assuming no communication, the TX on the JK-BMS GPS port should be default TTL high, right? It's low.

 

[upnorthandpersonal]

the TX on the JK-BMS GPS port should be default TTL high, right? It's low.

Yeah, by default an inactive UART should have a STOP bit on TX, which is logic high.

 

[braincore]

Is the best guess that the BMS is damaged then?

 

[upnorthandpersonal]

Could be, but can't say for certain. I would have to have the thing on my desk to make any definite conclusions.