esp32-poe esphome modbus

[solanek]

hello,
unfortunately i have a problem with ttl rs485 for modbus
board: olimex esp32-poe

cfg:

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uart:
  tx_pin: 4
  rx_pin: 36
  baud_rate: 9600
  stop_bits: 1

sensor:
  - platform: uptime
    name: Uptime Sensor     

  - platform: sdm_meter
    phase_a:
      current:
        name: "SDM Current"
    update_interval: 5s   
I also try GPIO1,3 but the same effect - not working
does anyone have the same board and modbus via ttl working  ?