密胺计量程序

RS485.py

@@ -0,0 +1,109 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+'''
+# @Time    : 2025/2/18 9:59
+# @Author  : hjw
+# @File    : RS485.py
+'''
+
+import time
+import threading
+import serial
+from collections import deque
+import logging
+
+# 配置日志系统
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
+    handlers=[
+        logging.FileHandler('controller.log'),
+        logging.StreamHandler()
+    ]
+)
+logger = logging.getLogger(__name__)
+
+
+class RS485Reader:
+    def __init__(self, config):
+        self.port = config['serial']['port']
+        self.baudrate = config['serial']['baudrate']
+        self.ser = None
+        self.current_weight = 0
+        self.running = True
+        self.lock = threading.Lock()
+        self.buffer = deque(maxlen=10)  # 数据缓冲
+        self._connect()
+
+    def _connect(self):
+        try:
+            self.ser = serial.Serial(
+                port=self.port,
+                baudrate=self.baudrate,
+                bytesize=8,
+                parity='N',
+                stopbits=1,
+                timeout=0.1
+            )
+            logger.info(f"成功连接串口设备 {self.port}")
+        except Exception as e:
+            logger.error(f"串口连接失败: {str(e)}")
+            raise
+
+    def read_weight(self):
+        cmd = bytes.fromhex('010300000002c40b')
+        try:
+            self.ser.write(cmd)
+            response = self.ser.read(9)
+            if len(response) == 9 and response[:3] == bytes.fromhex("010304"):
+                weight = int.from_bytes(response[3:5], 'big')
+                with self.lock:
+                    self.buffer.append(weight)
+                    self.current_weight = sum(self.buffer) // len(self.buffer)
+                return True
+            return False
+        except Exception as e:
+            logger.error(f"读取重量失败: {str(e)}")
+            self._reconnect()
+            return False
+
+    def tare(self):    # 去皮方法
+        cmd = bytes.fromhex('01060064000109d5')  # 01 06 00 64 00 01 09 d5
+        try:
+            if self.read_weight():  # 确保有最新数据
+                self.ser.write(cmd)
+                response = self.ser.read(8)
+                if len(response) == 8 and response[:3] == bytes.fromhex("010600"):
+                    self.buffer.clear()  # 清空缓冲
+                    self.current_weight = 0  # 重置当前重量
+                    self.read_weight()  # 确保有最新数据
+                    return True
+                else:
+                    self.buffer.clear()  # 清空缓冲
+                    return False
+            return False
+        except Exception as e:
+            logger.error(f"去皮操作失败: {str(e)}")
+            self._reconnect()
+            return False
+
+
+    def _reconnect(self):
+        max_retries = 3
+        for i in range(max_retries):
+            try:
+                if self.ser:
+                    self.ser.close()
+                self._connect()
+                return True
+            except Exception as e:
+                logger.warning(f"重连尝试 {i + 1}/{max_retries} 失败")
+                time.sleep(1)
+        logger.error("串口重连失败")
+        return False
+
+    def stop(self):
+        self.running = False
+        if self.ser and self.ser.is_open:
+            self.ser.close()
+