"# \u5982\u4f55\u4f7f\u7528 Python \u8bfb\u53d6 Modbus \u8bbe\u5907\u7684\u6570\u636e\uff1f\n\n> 2023-02-15 | 2024-05-07\n> https:\/\/www.modbus.cn\/en\/11825.html\n\n**Modbus\u7f16\u7a0b\u5f00\u53d1**\n\n---\n\n\u8981\u4f7f\u7528 Python \u8bfb\u53d6 Modbus \u8bbe\u5907\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528\u7b2c\u4e09\u65b9 Modbus \u5e93\uff0c\u5982 pymodbus\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc7 TCP \u6216 RTU \u7b49\u65b9\u5f0f\u8fde\u63a5\u5230 Modbus \u8bbe\u5907\uff0c\u7136\u540e\u8bfb\u53d6\u548c\u5199\u5165\u6570\u636e\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 pymodbus \u8bfb\u53d6 Modbus \u8bbe\u5907\u6570\u636e\u7684\u4e00\u4e9b\u57fa\u672c\u6b65\u9aa4\uff1a\n\n- \u5b89\u88c5 pymodbus \u5e93\uff1a\u53ef\u4ee5\u4f7f\u7528 pip \u547d\u4ee4\u5b89\u88c5 pymodbus \u5e93\uff0c\u4f8b\u5982\u5728\u547d\u4ee4\u884c\u4e2d\u8f93\u5165 pip install pymodbus\u3002\n\n- \u5bfc\u5165 ModbusClient \u7c7b\uff1a\u4f7f\u7528 from pymodbus.client.sync import ModbusTcpClient \u6216 from pymodbus.client.sync import ModbusSerialClient \u5bfc\u5165 ModbusClient \u7c7b\uff0c\u6839\u636e\u9700\u8981\u9009\u62e9 TCP \u6216 RTU \u8fde\u63a5\u65b9\u5f0f\u3002\n\n- \u521b\u5efa ModbusClient \u5bf9\u8c61\uff1a\u4f7f\u7528 ModbusClient \u7c7b\u521b\u5efa ModbusClient \u5bf9\u8c61\uff0c\u8bbe\u7f6e\u8fde\u63a5\u7684 IP \u5730\u5740\u3001\u7aef\u53e3\u53f7\u3001\u4e32\u53e3\u53f7\u7b49\u8fde\u63a5\u53c2\u6570\uff0c\u4f8b\u5982\n\n```\nclient = ModbusTcpClient('192.168.1.10', port=502)\n\n```\n\n\u6216\u8005\n\n```\nclient = ModbusSerialClient(method='rtu', port='\/dev\/ttyUSB0', baudrate=9600, timeout=1)\n\n```\n\n\u8bfb\u53d6\u6570\u636e\uff1a\u4f7f\u7528 ModbusClient \u5bf9\u8c61\u7684 read_coils\u3001read_discrete_inputs\u3001read_holding_registers \u6216 read_input_registers \u65b9\u6cd5\u8bfb\u53d6\u6570\u636e\uff0c\u6307\u5b9a\u8981\u8bfb\u53d6\u7684\u8d77\u59cb\u5730\u5740\u548c\u6570\u91cf\uff0c\u4f8b\u5982\uff1a\n\n```\n# \u8bfb\u53d6\u4fdd\u6301\u5bc4\u5b58\u5668\u5730\u5740\u4e3a 100\uff0c\u6570\u91cf\u4e3a 10 \u7684\u6570\u636e\nresult = client.read_holding_registers(100, 10)\n\n```\n\n- \u5904\u7406\u6570\u636e\uff1a\u4ece\u8bfb\u53d6\u7684\u7ed3\u679c\u4e2d\u63d0\u53d6\u9700\u8981\u7684\u6570\u636e\uff0c\u4f8b\u5982\u4f7f\u7528 result.registers \u83b7\u53d6\u4fdd\u6301\u5bc4\u5b58\u5668\u7684\u6570\u636e\uff0c\u7136\u540e\u8fdb\u884c\u8fdb\u4e00\u6b65\u7684\u5904\u7406\u6216\u663e\u793a\u3002\n\n- \u5173\u95ed\u8fde\u63a5\uff1a\u4f7f\u7528 ModbusClient \u5bf9\u8c61\u7684 close \u65b9\u6cd5\u5173\u95ed\u4e0e Modbus \u8bbe\u5907\u7684\u8fde\u63a5\uff0c\u4f8b\u5982\uff1a\n\n```\nclient.close()\n\n```\n\n\u901a\u8fc7\u4f7f\u7528 pymodbus \u5e93\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u8bfb\u53d6 Modbus \u8bbe\u5907\u7684\u6570\u636e\uff0c\u6839\u636e\u9700\u8981\u8fdb\u884c\u6570\u636e\u5904\u7406\u3001\u5b58\u50a8\u6216\u5c55\u793a\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4f7f\u7528 pymodbus \u5e93\u65f6\uff0c\u8981\u6839\u636e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\uff0c\u8bbe\u7f6e\u5408\u9002\u7684\u8fde\u63a5\u65b9\u5f0f\u3001\u5730\u5740\u548c\u53c2\u6570\u7b49\uff0c\u4ee5\u4fdd\u8bc1\u901a\u4fe1\u7684\u5b89\u5168\u3001\u7a33\u5b9a\u548c\u53ef\u9760\u3002\n\n---\n*modbus.cn*\n"