Need help with connecting ESP8266 via UART to JK_PB2A16S20P

[KopeH-3JIa]

Can't connect with UART to BMS
frame sequence don't contains frame start bytes (0x4E, 0x57) not sure maybe need to change something in bms config?

logs_jkbms-monitor_logs.txt

yaml:

substitutions:
  name: jk-bms
  device_description: "Monitor a JK-BMS"
  external_components_source: github://syssi/esphome-jk-bms@main
  tx_pin: GPIO1
  rx_pin: GPIO3

esphome:
  name: ${name}
  friendly_name: ${name}
  comment: ${device_description}
  min_version: 2024.6.0
  project:
    name: "syssi.esphome-jk-bms"
    version: 2.1.0

esp8266:
  board: nodemcuv2

external_components:
  - source: ${external_components_source}
    refresh: 0s

logger:
  baud_rate: 0
  level: DEBUG

uart:
  id: uart_0
  baud_rate: 115200
  rx_buffer_size: 384
  tx_pin: ${tx_pin}
  rx_pin: ${rx_pin}
  debug:
    direction: BOTH

# Enable Home Assistant API
api:
  encryption:
    key: "L2iv3bL7iJyqPtAZE5mXTiTJuQSAXqQ0dpLg/jeUsgg="

ota:
  - platform: esphome
    password: "bec2a72943186a59b89591c8a9dec37c"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

jk_modbus:
  - id: modbus0
    uart_id: uart_0
    rx_timeout: 50ms

jk_bms:
  - id: bms0
    jk_modbus_id: modbus0
    update_interval: 5s

binary_sensor:
  - platform: jk_bms
    balancing:
      name: "${name} balancing"
    balancing_switch:
      name: "${name} balancing switch"
    charging:
      name: "${name} charging"
    discharging:
      name: "${name} discharging"
    dedicated_charger_switch:
      name: "${name} dedicated charger switch"
    online_status:
      name: "${name} online status"

[syssi]

Which port do you use and which protocol is assigned to this port at the moment?

[KopeH-3JIa]

[syssi]

Same issue here:

>>> 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28
<<< 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28

There is a short circuit between your RX and TX pin for sure. Please check your wiring!! You are receiving your outgoing traffic because the RX pin is attached to the TX pin.

[KopeH-3JIa]

Tested cable with multimeter, on esp side there is no short circuit, on bms side there 200 Ohm resistance, don't know why it echo packets back(

[syssi]

Do you have another RS485 converter you could try? Could you provide a photo of your RS485 converter? Does it require flow control?

[KopeH-3JIa]

unfortunately no, will buy tomorrow another esp and another uart converter. Thanks for help, will update after new hardware come

[KopeH-3JIa]

Hi, sorry for delay. I switched ESP8266 to ESP32, also added UART to TTL

but still my setup won't work

>>> 
4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28
<<< 
05:10:16:20:00:01:02:00:00:E4:31:06:10:16:20:00:01:02:00:00:F0:C1
07:10:16:20:00:01:02:00:00:FD:51:08:10:16:20:00:01:02:00:00:BC:A1
09:10:16:20:00:01:02:00:00:B1:31:0A:10:16:20:00:01:02:00:00:A5:C1
0B:10:16:20:00:01:02:00:00:A8:51:0C:10:16:20:00:01:02:00:00:8E:61
0D:10:16:20:00:01:02:00:00:83:F1:0E:10:16:20:00:01:02:00:00:97:01
0F:10:16:20:00:01:02:00:00:9A:91:55:AA:EB:90:02:00:64:0D:66:0D:64
0D:64:0D:64:0D:63:0D:61:0D:64:0D:64:0D:58:0D:64:0D:41:0D:66:0D:66
0D:66:0D:63:0D:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:FF:FF:00:00:61:0D:25
00:04:0B:3C:00:3B:00:41:00:3E:00:42:00:42:00:46:00:3B:00:43:00:48
00:46:00:3F:00:43:00:40:00:41:00:3B:00:00:00:00:00:00:00:00:00:00
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00:0A:01:00:00:00:00:18:D6:00:00:00:00:00:00:00:00:00:00:D9:00:DC
00:00:00:00:00:A2:F8:02:64:C0:45:04:00:C0:45:04:00:01:00:00:00:4C
21:05:00:64:00:00:00:0B:DE:4E:00:01:01:00:00:00:00:00:00:00:00:00
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0A:00:00:3C:0A:00:00:42:0E:00:00:FC:0D:00:00:0A:00:00:00:06:0E:00
00:28:0A:00:00:10:0E:00:00:AC:0D:00:00:C4:09:00:00:80:38:01:00:03
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02:10:16:20:00:01:02:00:00:C2:01:03:10:16:20:00:01:02:00:00:CF:91

logs.txt