configuration.yaml

modbus:
  name: eastron
  type: serial
  method: rtu
  port: /dev/ttyUSB1
  baudrate: 9600
  stopbits: 2
  bytesize: 8
  parity: N

sensor:
  - platform: modbus
    scan_interval: 30
    registers:
      - name: L1 Voltage
        unit_of_measurement: V
        register: 0
        data_type: float
        precision: 2
        count: 2

lsusb

root@debian:~# lsusb 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 8087:0aa7 Intel Corp. 
Bus 001 Device 049: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 047: ID 0001:0000 Fry's Electronics MEC0003
Bus 001 Device 043: ID 1cf1:0030 Dresden Elektronik ConBee II
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

sdm_detect.log

# ./sdm_detect -s /dev/ttyUSB1 | tee ~/sdm_detect.log
2020/03/29 09:26:55 Starting bus scan
2020/03/29 09:26:55 Device 1: n/a
2020/03/29 09:26:55 Device 2: n/a
2020/03/29 09:26:56 Device 3: n/a
2020/03/29 09:26:56 Device 4: n/a
2020/03/29 09:26:56 Device 5: n/a
2020/03/29 09:26:57 Device 6: n/a
2020/03/29 09:26:57 Device 7: n/a
2020/03/29 09:26:57 Device 8: n/a
2020/03/29 09:26:57 Device 9: n/a
2020/03/29 09:26:58 Device 10: n/a
2020/03/29 09:26:58 Device 11: n/a
2020/03/29 09:26:58 Device 12: n/a
2020/03/29 09:26:59 Device 13: n/a
2020/03/29 09:26:59 Device 14: n/a
2020/03/29 09:26:59 Device 15: n/a
2020/03/29 09:26:59 Device 16: n/a
2020/03/29 09:27:00 Device 17: n/a
2020/03/29 09:27:00 Device 18: n/a
2020/03/29 09:27:00 Device 19: n/a
2020/03/29 09:27:01 Device 20: n/a
2020/03/29 09:27:01 Device 21: n/a
2020/03/29 09:27:01 Device 22: n/a
2020/03/29 09:27:01 Device 23: n/a
2020/03/29 09:27:02 Device 24: n/a
2020/03/29 09:27:02 Device 25: n/a
2020/03/29 09:27:02 Device 26: n/a
2020/03/29 09:27:03 Device 27: n/a
2020/03/29 09:27:03 Device 28: n/a
2020/03/29 09:27:03 Device 29: n/a
...
2020/03/29 09:28:02 Device 238: n/a
2020/03/29 09:28:03 Device 239: n/a
2020/03/29 09:28:03 Device 240: n/a
2020/03/29 09:28:03 Device 241: n/a
2020/03/29 09:28:03 Device 242: n/a
2020/03/29 09:28:04 Device 243: n/a
2020/03/29 09:28:04 Device 244: n/a
2020/03/29 09:28:04 Device 245: n/a
2020/03/29 09:28:05 Device 246: n/a
2020/03/29 09:28:05 Device 247: n/a
2020/03/29 09:28:05 Found 0 active devices:
2020/03/29 09:28:05 WARNING: This lists only the devices that responded to a known probe request. Devices with different function code definitions might not be detected.