2012年时即做过一个地磅称重软件,最近公司又接了一个地磅过磅软件的项目,把遇到的问题总结一下以备后用。
1.接线问题
因为客户方原来单独使用仪表,仪表未有接线和电脑连接,为此颇费周折才做好了接线。接线方式为仪表端所接阵脚为7、8,电脑端为2、5
2.读取仪表称重数
代码基本沿袭2012年为另一客户所开发的称重软件的代码。
注:本次客户所使用地磅为泰山衡器厂出的XK3200,但说明书上说明和耀华系列地磅兼容,而上一客户所使用地磅正是耀华XK3190,大概因此代码基本可直接通用。
下面贴代码了,使用的serialPort控件,命名为port
称重窗体设计器代码页 FrmWeigh.designer.cs中
this.port.BaudRate = 2400; this.port.Parity = System.IO.Ports.Parity.Even; this.port.StopBits = System.IO.Ports.StopBits.OnePointFive; this.port.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(this.port_DataReceived);
称重窗体FrmWeigh.cs获取地磅仪表数核心代码部分:
1 /// <summary> 2 /// 串口读取数据 3 /// </summary> 4 private void port_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e) 5 { 6 Thread.Sleep(100); 7 if (false == this.port.IsOpen) return; 8 byte firstByte = Convert.ToByte(port.ReadByte()); 9 if (firstByte == 0x02) 10 { 11 int bytesRead = port.ReadBufferSize; 12 byte[] bytesData = new byte[bytesRead]; 13 byte byteData; 14 15 for (int i = 0; i < bytesRead - 1; i++) 16 { 17 byteData = Convert.ToByte(port.ReadByte()); 18 if (byteData == 0x03)//结束 19 { 20 break; 21 } 22 bytesData[i] = byteData; 23 } 24 strReceive = Encoding.Default.GetString(bytesData); 25 } 26 tbWeight.Invoke(new EventHandler(delegate { tbWeight.Text = GetWeightOfPort(strReceive); })); 27 } 28 29 /// <summary> 30 /// 返回串口读取的重量 31 /// </summary> 32 /// <param name="?"></param> 33 /// <returns></returns> 34 private string GetWeightOfPort(string weight) 35 { 36 if (string.IsNullOrEmpty(weight) || weight.IndexOf("+") < 0 || weight.Length < 6) 37 { 38 return "0.000"; 39 } 40 weight = weight.Replace("+", ""); 41 weight = int.Parse(weight.Substring(0, 3)).ToString() + "." + weight.Substring(3, 3); 42 return weight; 43 }