JK BMS RS485 Communicate Protocol Manual

[upnorthandpersonal]

The info I linked to is correct:

Hankzor JK BMS with screen and power button

silicone wire Thanks. I was hoping there was someplace in North America that had it stocked already.

diysolarforum.com

They call it RS485 because the RS485 adapter plugs in there (the 4 pin socket), but the signal at that port is UART/TTL, and can therefor be connected to a UART/TTL to USB converter. I have this also mentioned on my Github, and have Python code there to talk to the BMS:

GitHub - PurpleAlien/jk-bms_grafana: Read data from a JK BMS and graph it in Grafana

Read data from a JK BMS and graph it in Grafana. Contribute to PurpleAlien/jk-bms_grafana development by creating an account on GitHub.

github.com

The CAN bus (3 pin socket) is only present if this is explicitly enabled, which it is not by default (at least not last time I checked).

 

[Steve_S]

If someone wants to send me the info I can help do the compiling to make a comprehensive doc for here (or maybe @Steve_S who show very polished authoring skills)

Thanks for the nice words but I'm not doing manuals or guides anymore. I have no idea where the protocol stack information is for the JK's (Standard or Inverter editions).

 

[Familymandan]

Is this the RS485 connector?
SH Connectors
SHR-04V-S-B??

 

[tinyt]

Is this the RS485 connector?
SH Connectors
SHR-04V-S-B??

Data sheet says 1mm pitch.

I think you need 1.25mm pitch.

I have ordered this for next day delivery.
It includes 4-pins and both genders. Will find out which fits when I get it.

 

[tinyt]

Data sheet says 1mm pitch.

I think you need 1.25mm pitch.

I have ordered this for next day delivery.
It includes 4-pins and both genders. Will find out which fits when I get it.

It works. Note that the TTL232 gnd is connected to B- and not P-.

 

[Familymandan]

Hi Tiny,
Great job!! I'll test mine asap. Thank you!!

 

[tinyt]

In my case, using a pointed X-acto knife blade, I am going to swap the position of the black and green wires as I usually associate black color with electrical ground.

Edit: And I am going to remove the red wire, I don't want to mistakenly apply battery plus to my monitoring circuit.,

 

[markthesparkisashark]

I think it is this one.

I have the PC software which comes with a comms dump, I can copy the commands ( on the GPS port with protocol set to JK485 on the app)
and they look nothing like the document 01 10 10 7C 00 02 04 00 04 41 D8 48 D5 sets the battery to 280AH ( from the dump on the software)
it works, can change the battery ah and then spit this to the port and it changes the value, all very odd

 

[Johnster62]

Hello, I am looking for the JK BMS RS485 Communicate Protocol Manual. I am wanting to use the RS485 port to communicate with my PLC (Programmable Logic Controller). Via RS485/Modbus, Master/Slave.
I already communicate with my Sigineer Inverter and (5) Solar Charge Controllers this way.
I attached the Sigineer manual as an example.
OR, does anyone have a good tech support contact for JK BMS?

Hi, Did you ever resolve this? I am looking to do a similiar thing, what i am chasing is a traditional modbis list, ie a list of registers to poll via modbus RTU to a PLC. Did you ever find that? example attached of what i got for Seplos