Visual upper system design and development (Halcon WinForm) -4 Communication management

This paper will briefly introduce the design idea of communication between the system operation and the actual upper or lower level .

General production line machine vision project , After the products are put in place through the conveyor line ,PLC Inform the vision to take photos and analyze images , The final result is output to PLC And output to the upper MES Systems, etc .

This article takes TCP For example, communication . Pictured ：

Here we define the communication device , Take the visual system as TCPSERVER, Inferior and superior   by TCP client ,

First, define the server IP port , Then define the message receiving event , Message sending event . Here we will use the application of global variables mentioned above .

 

Define how to handle the received characters in the receiving event , And trigger the changes of other variables after receiving, so as to trigger the work of other threads of the system ,

In the sending event, the sending event is triggered under certain conditions , And the sent data can be combined with customized fixed content and dynamic variables .

 

  The above figure shows the whole process from communication trigger execution to result feedback .

public abstract class DeviceCommumicationClient
    {
        public long Id { set; get; } 
        public CommumicationTypeEnum CommumicationType { set; get; }
        public string Name { set; get; }
        public string Ip { get; set; }
        public bool IsNeedRestart { set; get; } = false;
        public bool IsRemove { set; get; } = false;

        public int Port { get; set; }

        public bool IsAutoReConnect { set; get; }

        public bool IsActive { set; get; }

        public bool IsFirst { set; get; }

        public List<DeviceMessageHistory> ReceiveMsgList { set; get; }

        public virtual void SendMessage(string msg) { 
        
        }
        public virtual string ReceiveMessage()
        {

            return "";
        }
        public virtual bool Init()
        {
            return true;
   
        }
        public virtual bool Stop()
        {
            return true;

        }
    }