JK bms RS485 Modbus V1.0 issue

[kovaroman]

Hi, I have a JK B2A8S20P with a JK RS485 adapter (GPS UART port to RS485 port), it is working OK on windows with JK monitor app. I have configured on linux your configurator, tried to use ID 0 and 1, 115200 baud rate and 9600, my PC rs485 adapter is based on CH340 chip and starts on port /dev/ttyUSB0

On windows my JK protocol is set to JK BMS RS485 Modbus V1.0 and works well with JK monitor app, when I set this protocol and try to start your script (BMS type: JK_RS485, ID: 1, Port: /dev/ttyUSB0, Baudrate: 115200, Delay: 1000), it sends request and doesn't receive response.

here is part of log:

2024-09-03 10:26:44.916 | INFO  | Thread-10  | verter.BmsToInverter:268   | Reading BMS #1 JK_RS485 on /dev/ttyUSB0...
2024-09-03 10:26:44.917 | INFO  | Thread-10  | stoinverter.core.BMS:130   | ---------------------------------> Thread 28
2024-09-03 10:26:44.917 | DEBUG | Thread-10  | s485.JSerialCommPort:180   | Clearing RX buffers
2024-09-03 10:26:44.918 | DEBUG | Thread-10  | s485.JSerialCommPort:159   | Send: Buffer (HEX): [0x4E, 0x57, 0x00, 0x13, 0x00, 0x00, 0x00, 0x00, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00, 0x00, 0x01, 0x29]

2024-09-03 10:26:45.221 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 1 times!
2024-09-03 10:26:45.222 | DEBUG | Thread-10  | .JKBmsRS485Processor:186   | Waiting for messages to arrive....
2024-09-03 10:26:46.426 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 2 times!
2024-09-03 10:26:46.427 | DEBUG | Thread-10  | .JKBmsRS485Processor:186   | Waiting for messages to arrive....
2024-09-03 10:26:47.631 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 3 times!
2024-09-03 10:26:47.631 | DEBUG | Thread-10  | .JKBmsRS485Processor:186   | Waiting for messages to arrive....
2024-09-03 10:26:48.835 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 4 times!
2024-09-03 10:26:48.835 | DEBUG | Thread-10  | .JKBmsRS485Processor:186   | Waiting for messages to arrive....
2024-09-03 10:26:49.185 | INFO  | Thread-12  | verter.BmsToInverter:294   | Sending to inverter PYLON_RS485 on /dev/ttyUSB0...
2024-09-03 10:26:49.185 | DEBUG | Thread-12  | verter.core.Inverter:187   | No battery data yet received to send to inverter!
2024-09-03 10:26:50.038 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 5 times!
2024-09-03 10:26:50.039 | DEBUG | Thread-10  | .JKBmsRS485Processor:186   | Waiting for messages to arrive....
2024-09-03 10:26:51.243 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 6 times!
2024-09-03 10:26:51.243 | DEBUG | Thread-10  | .JKBmsRS485Processor:186   | Waiting for messages to arrive....
2024-09-03 10:26:52.448 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 7 times!
2024-09-03 10:26:52.449 | DEBUG | Thread-10  | .JKBmsRS485Processor:186   | Waiting for messages to arrive....
2024-09-03 10:26:53.653 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 8 times!
2024-09-03 10:26:53.653 | DEBUG | Thread-10  | .JKBmsRS485Processor:186   | Waiting for messages to arrive....
2024-09-03 10:26:54.189 | INFO  | Thread-12  | verter.BmsToInverter:294   | Sending to inverter PYLON_RS485 on /dev/ttyUSB0...
2024-09-03 10:26:54.190 | DEBUG | Thread-12  | verter.core.Inverter:187   | No battery data yet received to send to inverter!
2024-09-03 10:26:54.858 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 9 times!
2024-09-03 10:26:54.858 | DEBUG | Thread-10  | .JKBmsRS485Processor:186   | Waiting for messages to arrive....
2024-09-03 10:26:56.062 | DEBUG | Thread-10  | .JKBmsRS485Processor:176   | No bytes received: 10 times!
2024-09-03 10:26:56.063 | ERROR | Thread-10  | .JKBmsRS485Processor:199   | Error sending frame: Buffer (HEX): [0x4E, 0x57, 0x00, 0x13, 0x00, 0x00, 0x00, 0x00, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x68, 0x00, 0x00, 0x01, 0x29]

2024-09-03 10:26:56.063 | INFO  | Thread-10  | verter.BmsToInverter:320   | 
BMS	SOC	  V  	  A  	 CellMinV 	 CellMaxV	CellDiff

2024-09-03 10:26:56.063 | INFO  | Thread-10  | verter.BmsToInverter:390   | BMS alarms: 
	NONE

I tried different config combinations, tried to changed UART protocol on BMS to (9600) JK BMS RS485 Modbus V1.0 and set Baudrate 9600 in configurator, nothing changed. Does your script support JK BMS RS485 Modbus V1.0 protocol on RS485?

[ai-republic]

Have you tried

cat /dev/ttyUSB0

and see if data is coming?
If your JK is a Modbus version, then the JK_RS485 BMS binding will not work. It is for pure RS485 not for Modbus RTU protocol specification.
If you can provide the JK Modbus RTU specification then I can create a binding for that :)

[kovaroman]

Louisvdw/dbus-serialbattery#969 (comment) - here are some info about JK BMS RS485 Modbus V1.0

https://github.com/Louisvdw/dbus-serialbattery/files/14483776/BMS.RS485.Modbus.V1.0.pdf - original
https://github.com/Louisvdw/dbus-serialbattery/files/14483784/Jikong.BMS.RS485.Modbus.universal.protocol.V1.0.pdf - translated

Thanks)

[ai-republic]

@kovaroman sorry I've been quite busy the last couple of weeks. I will try to implement the JK ModBus BMS binding this or next weekend

[ai-republic]

@kovaroman I had a look a the specifications you sent but the translated version is all messed up. But I will try to combine the both to make some sense of it 😄

[ai-republic]

Hi @kovaroman,
I implemented the JK ModBus BMS binding. Could you download the latest Configurator and test please. Make sure you have log level set to debug, Please attach the bmstoinverter.log here so that I can check if everything is reading the data correctly.