Native RS485 port support

[lucize]

somehow it seems that my ttl (gps) port is not working anymore, there are discussion about not using a stepdown coverter and powering it by the battery.
I have the hardware version that also support rs485 switch on the CAN port, I activated that and it seems that I can read some data, but I'm not good at all with modbus. I've used an usb to rs485 adapter and some app in windows to read the registers
I was thinking that since there is support for ttl to rs485 this could also work with native port but it seems that esp32 doesn't get any data, used the rs485 ttl addapter to connect to esp32 something like this but don't know exactly if the ttl pin layout is the same rx from r485 board to pin17 and tx to pin16, tried different speed for ttl also reverse rx/tx

edit:
seems that the rx/tx don't need to be crossed

logs_jk-bms_run(2).txt
logs_jk-bms_run(1).txt
logs_jk-bms_run.txt

output connecting the usb adapter:

[Uksa007]

Hi,

Can I ask what model JK BMS you are using?
Your logs show no data from the BMS is being received.

How long are the wires from the JKBMS GPS port to the ESP32?
Have you double checked you are using the correct pins on the JKBMS GPS port and EP32?
Can you post a pic?

I have not used the RS485 port and don't know if it work at all, eg I suspect the data structure will be different.

[lucize]

the board is v11 I think 2A20P

the ttl connection worked fine until I reconnected (powered up) the esp32 board, I assume it is faulty as the temp on sensors as you can see is bad (data matches with the Bluetooth connection using the phone app), if I power up the esp32 and ttl connected, the temp will be real (or I think they are..) address 6 and 7

ok, so I guess I'll try and see with syssi if he has some ideas on how to request more info via modebus

[Uksa007]

the ttl connection worked fine until I reconnected (powered up) the esp32 board,

What do you mean, how do you know it worked?

Are the wires short like less than 20cm short?

I have had one other person who has a faulty GPS port with no data, he sent it back as faulty and got a new one, problem solved.

[lucize]

It worked because I used it for a few days, but wanted to do some cable optimizations and management and disconnected the esp power, after reconnect I heard a poc and no more data to inverter, I'm trying to work with the seller to see if I can have a replacement, but on the long run rs485 should be the true option as the ttl port seems to not have great protection, event with the original jk-rs485 adapter I guess should be the default setup.. the cable is ~5cm but that's not the issue

[Uksa007]

on the long run rs485 should be the true option

I have always recommend using the JK-RS485 adaptor for longer runs, as per the schematic on the home page!

I use the JK-RS485 adaptor and separate RS485 adaptor for the ESP32 as I have long run 5m or so to the ESP32 as I'm always testing stuff.

JK-BMS GPS port  to ESP32 using RS485 for long runs

              RS485-TTL                  RS485             RS485-TTL               RS232-TTL                CAN BUS
┌──────────┐            ┌───────────┐           ┌────────┐           ┌─────────┐             ┌─────────┐              ┌──────────┐
│          │<--- TX --->│Y    JK   Y│<A------A+>│        │<TX-----RX>│16     23│<TX-------TX>|         |              |          |
│  JK-BMS  │<--- RX --->│W  RS485  W│<B------B->│ RS485  │<RX-----TX>│17     22│<RX--4K7--RX>| TJA1050 |<---CAN H --->| Inverter |
│          │<--- GND -->│B Adaptor B│<---GND--->│To 3.3V │<---GND--->|         |<----GND---->|   CAN   |<---CAN L --->|          |
│          │<--Bat V -->│R          │           │        │<---3.3V-->|  ESP32  |<----5 V---->|         |              |          |
└──────────┘            └───────────┘           └────────┘           └─────────┘             └─────────┘              └──────────┘

[denveronly]

somehow it seems that my ttl (gps) port is not working anymore, there are discussion about not using a stepdown coverter and

just get another bms

[Uksa007]

At this time there is only support for the GPS port.
Suggest you get a replacement BMS with a working GPS port.