您实际上在哪里打开了串行端口连接?

看到您正在使用VB.net时，您是否看过My.Computer.Ports.OpenSerialPort

http://msdn.microsoft.com/en-us/library /tf5cds00(v=vs.80).aspx#Y1529 [ http://msdn.microsoft.com/en-us/library/system. io.ports.serialport.aspx [ ^ ]

Where have you actually OPENED the serial port connection?

Seeing as you are using VB.net, have you looked at My.Computer.Ports.OpenSerialPort

http://msdn.microsoft.com/en-us/library/tf5cds00(v=vs.80).aspx#Y1529[^]

And the serial port class documentation; http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.aspx[^]