JK BMS V19 (19.10 firmware) UART 2 not correct on slave.

[diyers230ah]

https://www.jkbms.com/wp-content/uploads/2024/06/JK-BMS-User-Manual-for-PB-series-jkbms.com_.pdf

See the table from the manual.

As per the manual
Master id = 0 (0000 dipswitch)
Slave id = 2 (0100 disswitch)
Correct ser?

 

[diyers230ah]

ModbusID is selected via dip-switches.
For the master battery, I reserve the Modbus ID 0 (for running) and 1 (for PC app settings)
Modbus ID = 0. Other values = slaves.
When the Modbus ID is 0, the PC app will not function to modify the settings.

My second battery has the Modbus ID = 2.
If the Modbus ID is different from 0 => slave battery => UART2 protocol is fixed to 015 for communications between batteries).
You use the UART 2 (the two ports on the right, NOT close to the can) to connect the batteries.

I did ser Master id = 0, but in contrary the PC app still functioning and is able to modify settings. Also, UART2 Prtocol was still fixed to 017 RS485 Protocol 17. Even if i changed the id = 1, 2 3 etc the UART is always at 017 greyed out.

 

[diyers230ah]

ModbusID is selected via dip-switches.
For the master battery, I reserve the Modbus ID 0 (for running) and 1 (for PC app settings)
Modbus ID = 0. Other values = slaves.
When the Modbus ID is 0, the PC app will not function to modify the settings.

My second battery has the Modbus ID = 2.
If the Modbus ID is different from 0 => slave battery => UART2 protocol is fixed to 015 for communications between batteries).
You use the UART 2 (the two ports on the right, NOT close to the can) to connect the batteries.

Tried Slave id = 1, UART2 Protocol changed to 000 - 4G GPS Remote module protocol.
But still cannot communicate to Master w/c was at id = 0, UART2 Protocol = 017.
What a headache. Im so stress already and my battery still cannot use in parallel

 

[On_The_Road]

I have the same problem with the UART 2 settings.

JKBMS V19 with Firmware V19.10
PC SW 3.2.0 @ RS485-1

Good BMS at ID0000(Master)
View attachment 323017

Good BMS at ID0001(Slave)
View attachment 323018


Bad BMS at ID0000(Master)
View attachment 323016


Bad BMS at ID0001(Slave)
View attachment 323015

As you can see the "broken" BMS shows in slave mode the wrong protocol and cant be operated as slave.
In master mode the protocol seems ok and the BMS can be used as Master

Seem like a firmware BUG.

On the PC Software and Android App the settings of UART 2 are greyed out and can not be changed by user.
Any ideas? Is there any way to do some kind of "factory" reset?

Things I tried:
- Downgrading FW to 19.05 and back to 19.10

Hey Max - did you solve this? I have been working on this for hours....

Thanks!

 

[saty1]

Hello

I have just build my last battery (for now). In total i have 4, in Yixiang V.2 enclosures, with JK inverter BMS V.19. I have updated to firmware 19.10, The first tree went fine, and communication was working from start. Today i had so many problems with the fourth pack. First it interrupted all the communication on the RS485-2 ports. After fidelling a lot with it changed cables and so on, I saw that UART 2 ( The one that is chosen by the bms it self) was set to 1 JK BMS 485 on the 2 slaves that worked but on battery 4 (adress 3) it was set to the 4g protocol. Then I set UART 1 to protocol 1 JK BMS 485 and connected Battery 4 (adress 3) RS485 -1 to Battery 3 (adress 2) RS485-2. The made the pack work! Not the intended connection, but it confirmed my theory about UART 2 protocol being wrong)

Any ideas?

Regards Tommy

Hello, I had the same problem with 4 jk bms v19, 3 worked perfectly, 1 stuck on master mode, regardless of dip switch setting, all with firmware 19.10. The problem was solved by forced update to firmware 19.16, after the update all 4 jk bms v19 work perfectly. Try a firmware update to 19.16 version. Download from here: https://diysolarforum.com/threads/jk-bms-v19-firmware-versions.108167/post-1614661

 

[Fer_DK]

Thank you! Will try soon

 

[Chrbmw]

I am having the same problem. My uart2 setting seems to be locked to no. 16 when device id set to 0. If ID is set to 1, then I can change the Uart2 setting. What is the solution?

 

[saty1]

I am having the same problem. My uart2 setting seems to be locked to no. 16 when device id set to 0. If ID is set to 1, then I can change the Uart2 setting. What is the solution?

The solution is above, try installing firmware version 19.16. It worked for me!

 

[Maksymilian]

zainstalowałem wersję 19.16 i w trybie master UART2 mam na 21 to jest prawidłowe?

 

[christianrodher]

Tried Slave id = 1, UART2 Protocol changed to 000 - 4G GPS Remote module protocol.
But still cannot communicate to Master w/c was at id = 0, UART2 Protocol = 017.
What a headache. Im so stress already and my battery still cannot use in parallel

was you able to fix it? one of mine is also 000 instead of 001

 

[jarnodrenth]

Thank you! Will try soon

Did is solve your problem?

 

[gabrielu]

I also have UART2 not working as slave (DIP other than 0) on 3 x JK BMS pb2a16s20p (locked on 000 - 4G... ) "fireware" 19.16 and 19.18 not helped. As I only have 3, i connect them in paralell from the master UART2_1 -> Slave1_UART1, master UART2_2 -> Slave2_UART1, Master CAN to Inverter. JK support not answering anymore.... Initially, I got a reply from them a month ago, that they will send me a firmware the next day that will solve the issue, but never got anything after.... It is unbelievable, that they can ignore customers in this manner.

 

[jarnodrenth]

I also have UART2 not working as slave (DIP other than 0) on 3 x JK BMS pb2a16s20p (locked on 000 - 4G... ) "fireware" 19.16 and 19.18 not helped. As I only have 3, i connect them in paralell from the master UART2_1 -> Slave1_UART1, master UART2_2 -> Slave2_UART1, Master CAN to Inverter. JK support not answering anymore.... Initially, I got a reply from them a month ago, that they will send me a firmware the next day that will solve the issue, but never got anything after.... It is unbelievable, that they can ignore customers in this manner.

Did you try a forced update?

 

[gabrielu]

Did you try a forced update?

Forced update to 19.10. No luck. The reset button doesn't reset s...t. I went a litle crazy and intrerrupted the firmware update process (pulled the cable at 49%) and after that I reflashed. Every setting was reset to factory, EXCEPT the read only UART2 value....still on 000-4G....

 

[jarnodrenth]

Forced update to 19.10. No luck. The reset button doesn't reset s...t. I went a litle crazy and intrerrupted the firmware update process (pulled the cable at 49%) and after that I reflashed. Every setting was reset to factory, EXCEPT the read only UART2 value....still on 000-4G...

The solution for me was update to 19.16. Export the settings from a good bms and import them to the bad one.

 

[gabrielu]

The solution for me was update to 19.16. Export the settings from a good bms and import them to the bad one.

tried already, not working.

 

[gabrielu]

tried Miro's code generator again (I saw that it had been updated in 17 October. Previous, unsuccessful try was in the beginning of October) and worked. Code generator now accepts all serial numbers and the generated code works. So "Erase history data" resets BMS to DEFAULT which solved UART2 for me also.
Thank you @mirofromdiro on GitHub.
Thank you @cali-clim for pointing me to "Erase history data"

 

[alagi]

I can confirm, 'Erase history data' worked on 2 BMSes. Still on 19.10 firmware. UART2 is now set correctly, according to the address. The code generator at https://mirofromdiro.github.io/JK-firmware-code/ worked in spite of haveing letters in the serial number.