https://github.com/eydam-prototyping/mp_modbus

Modbus Lib for Micropython
https://github.com/eydam-prototyping/mp_modbus

Last synced: 3 months ago
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Modbus Lib for Micropython

• Host: GitHub
• URL: https://github.com/eydam-prototyping/mp_modbus
• Owner: eydam-prototyping
• License: mit
• Created: 2021-07-22T11:34:03.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2021-09-16T14:02:07.000Z (about 3 years ago)
• Last Synced: 2024-04-22T12:33:28.566Z (7 months ago)
• Language: Python
• Size: 53.7 KB
• Stars: 11
• Watchers: 2
• Forks: 2
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-micropython - mp_modbus - Modbus library for MicroPython. (Libraries / Communications)

README

        
# mp_modbus

Modbus Lib for Micropython

## mp_modbus_frame

Create a modbus frame (you shouldn't have to do it by yourself):

  ```python

  from mp_modbus_frame import modbus_rtu_frame, modbus_tcp_frame

  # RTU

  rtu_frame = modbus_rtu_frame(

      device_addr=1,    # slave address

      func_code=3,      # function code

      register=100,     # requested register

      length=2,         # number of requested registers

      fr_type="request" # type of frame

    )

  # or parsing:

  rtu_frame = modbus_rtu_frame.parse_frame(

    bytearray([0x01, 0x03, 0x00, 0x12, 0x00, 0x08, 0xe4, 0x09])

    )

  # TCP

  tcp_frame = modbus_tcp_frame(

      transaction_id=1, # transaction id

      unit_id=1,        # unit id

      device_addr=1,    # slave address

      func_code=3,      # function code

      register=100,     # requested register

      length=2,         # number of requested registers

      fr_type="request" # type of frame

    )  

  # or parsing:

  tcp_frame = modbus_tcp_frame.parse_frame(

    bytearray([0x00, 0x01, 0x00, 0x00, 0x00, 0x06, 0x01, 0x03, 

        0x00, 0x12, 0x00, 0x08])

    )

  ```

## mp_modbus_master

RTU-Master or TCP-Client:

```python

from mp_modbus_master import modbus_rtu_master, modbus_tcp_client

# RTU

rtu_master = modbus_rtu_master(

  uart_no=2, parity=0, tx_pin=12, rx_pin=13, en_pin=32

  )

frame = rtu_master.read_holding_registers(305, 1)

print(frame.data)

# TCP

```