Stop working after power off

[Kentrp]

Hi! I have a problem with rs485 connection after power of slave board stop working on modbus protocol, i have to reflash them with modbus: and modbus controller: on the first time after that's i modbus: and modbus controller: off and connection begin work ok, can you help me how to repair it?

substitutions: device_name: Garden irrigation 2 ############################### device_ip: 192.168.1.62 ###############################

esphome: name: garden-irrigation-2 ##################### name_add_mac_suffix: true on_boot: priority: -100 then:

• delay: 30s
• logger.log: "* In da boot ***"

esp32: board: esp32dev framework: type: arduino

external_components:

• source: github://kecajtop/dtr0xx_io@master refresh: 60s components:
  • dtr0xx_io
• source: github://epiclabs-io/esphome-modbus-server@master refresh: 60s components:
  • modbus_server

wifi: !include includes/wifi.yaml captive_portal: api: !include includes/api.yaml ota: !include includes/ota.yaml
<<: !include includes/web.yaml

logger: level: debug baud_rate: 0 debug: update_interval: 5s text_sensor:

• platform: debug reset_reason: name: ${device_name} Reset Reason

time:

• platform: sntp id: my_time

i2c: sda: 4 scl: 5 scan: true id: bus_a frequency: 400kHz

uart: id: mod_bus tx_pin: 1 rx_pin: 3 baud_rate: 115200 stop_bits: 1
data_bits: 8 parity: none debug: direction: BOTH

modbus:

modbus_controller:

modbus_server:

• id: modbuserver uart_id: mod_bus address: 2 # slave address holding_registers:
  • start_address: 79 # starting register range default: 82 # default value for all those registers number: 10 # number of registers in the range on_write: | ESP_LOGI("ON_WRITE", "This is a lambda. address=%d, value=%d", address, value); return value; on_read: | # called whenever a register in the range is read // 'address' contains the requested register address // 'value' contains the stored register value ESP_LOGI("ON_READ", "This is a lambda. address=%d, value=%d", address, value); return value; // you can return the stored value or something else.
  • start_address: 200 # in this example we map register 200 to a switch number: 1 on_write: | if(value) id(relay_1)->turn_on(); else id(relay_1)->turn_off(); return value; on_read: | return id(relay_1)->state ? 1 : 0;

[kecajtop]

Hi Kentrp,

I did promise to help you but I am in the middle of house move.

I never used modbus slave library in production. I did run few tests and it did behavie as expected.

Do you have RS485 to USB cable for debugging? Do you have a logic analyser? Do you have another Modbus device for comparison?

We need to excude hardware problem first.

First would be a baudrate check, then try to add bias resistors or use common ground. RS485 can be problematic sometimes.

Regards Jack