Hi there -
I'm looking to flash my T-RSC3 with esphome and use the RS485 interface to expose sensors to my home assistant installation.
I currently have my RS485 A/B buses wired up to my modbus device (which is device 0x1). From what I understand RS485 TX is GPIO10 and RX is GPIO03.
So far I'm not getting any proper 2-way communication with the modbus device (including when I've tried swapping the A/B wires just in case). This is my esphome configuration, could you please confirm that the pins and settings look correct as far as you can see? I will also be following up on the esphome support for support on the software side. I can confirm that with similar settings on a USB RS485 adapter, I am able to communicate with the modbus device however.
esphome: name: hvac-01 friendly_name: hvac-01 esp32: board: esp32-c3-devkitm-1 variant: esp32c3 framework: type: arduino # Enable logging logger: # Enable Home Assistant API api: encryption: key: "REDACTED" ota: password: "REDACTED" wifi: ssid: !secret wifi_ssid password: !secret wifi_password # Enable fallback hotspot (captive portal) in case wifi connection fails ap: ssid: "Hvac-01 Fallback Hotspot" password: "REDACTED" captive_portal: #======================== uart: id: modbus_uart1 tx_pin: GPIO10 rx_pin: GPIO03 baud_rate: 9600 stop_bits: 1 parity: NONE modbus: id: modbus1 uart_id: modbus_uart1 send_wait_time: 200ms modbus_controller: - id: modbus_controller1 modbus_id: modbus1 ## the Modbus device addr address: 0x1 setup_priority: -10 # ======================== # modbus coil registers # ======================== switch: - platform: modbus_controller modbus_controller_id: modbus_controller1 id: zone1_on_off name: "Zone 1 - On/Off" register_type: coil address: 0x0000 bitmask: 1 entity_category: config icon: "mdi:toggle-switch" - platform: modbus_controller modbus_controller_id: modbus_controller1 id: zone1_auto_swing name: "Zone 1 - Auto Swing" register_type: coil address: 0x0001 bitmask: 1 entity_category: config icon: "mdi:toggle-switch"
Any help here is greatly appreciated.
I should also note that with this configuration, esphome successfully flashes and connects to Wi-Fi as though everything is great. When I update the state of the On/Off or Swing register however, it says that no modbus response is received.
teastain2 last edited by
@jourdant Not only swapping A/B wires but also remember that the LilyGO boards TX is the Modbus device's RX !