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Python script to debug Modbus communication with a SBC ALD1D5FD energy meter
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| #!/usr/bin/env python3 | |
| # | |
| # required modules: pymodbus 'pymodbus[serial]' | |
| # | |
| from pymodbus.client import ModbusSerialClient | |
| from pymodbus.framer.rtu_framer import ModbusRtuFramer | |
| from pymodbus.framer.binary_framer import ModbusBinaryFramer | |
| from pymodbus.framer.ascii_framer import ModbusAsciiFramer | |
| import logging | |
| def main(): | |
| logging.basicConfig() | |
| log = logging.getLogger() | |
| log.setLevel(logging.DEBUG) | |
| client = ModbusSerialClient( | |
| port='/dev/ttyUSB0', | |
| baudrate=19200, | |
| bytesize=8, | |
| parity='E', | |
| stopbits=1, | |
| timeout=1, | |
| framer=ModbusRtuFramer | |
| ) | |
| print('connected:', client.connect()) | |
| print(client) | |
| for address in range(3): | |
| print('try address:', hex(address)) | |
| for slave_id in range(30,31): | |
| print(f'{slave_id=}') | |
| print('read_holding_registers', client.read_holding_registers(address=address, count=1, slave=slave_id)) | |
| print('read_device_information', client.read_device_information(address=address, count=1, slave=slave_id)) | |
| client.close() | |
| main() |
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Output: