Learning to realize serial communication programming in MSComm in LabVIEW-EEWORLD

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Problem description: For general applications, LabVIEW can be implemented directly using the VISA serial port API function, which is convenient and fast. However, for serial communication that requires the use of interrupts, the MSComm control must be used to implement it.

MSComm control: To operate ActiveX control, the most important thing is to use its properties, method functions, and handle the callback of interrupt events. LabVIEW provides 8 functions in "ActiveX" of "Interconnect Interface" for the control set for ActiveX: Automation Open, Close Reference, To Variant, Variant to Data, Invoke Node, Property Node, Register Event Callback, UnRegister Event Callback.

Using the MSComm control in LabVIEW:

First, you need to add MSComm to LabVIEW. In "Tools"--"Import"--"ActiveX to Palette", add MSComm to the LabVIEW environment and select the default path.

Then you can find mscomm in ".Net and ActiveX" on the front panel and drag it to the front panel. You can also place an ActiveX container on the front panel first, then right-click and select the mscomm control:

[MSComm] Learning to implement serial communication programming with MSComm in LabVIEW

Call the ActiveX control to create a client application:

Mainly use 8 functions in "interconnection interface" -- "ActiveX":

ActiveX event registration related: using event callbacks to handle interrupt events, etc.

Programming Notes:

For the MSComm control, its automation reference is used during programming, that is, LabVIEW treats the ActiveX control as an object. Connect a property node to the control to view all properties. When connecting a call node, MSComm does not provide any methods, so it will be displayed as no method. The following are the properties of MSComm seen in LabVIEW:

In addition, the callback event registration must first determine what kind of data needs to be transmitted. If it contains multiple data types, a cluster can be used to solve it. The callback function will automatically create event parameters with the same data type and provide a reference to the ActiveX control.

Keywords：LabVIEW Reference address：Learning to realize serial communication programming in MSComm in LabVIEW

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