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Error Messages (MS Comm Control) (MSComm Control) – Visual Basic: MSComm Control. Visual Studio 6.0 Error Messages (MS Comm Control) See Also. The. 8021: Internal error.
See Also. The following table lists the trappable errors for the MSComm control. comDCBError, 8021, Internal error retrieving device control block for the port.
The MSComm Error 8021 with desc.: "Application-defined or. – In the current circumstance, I suppose the error 8021 is caused by MSComm control. The description of the error 8021 for MSComm control is "Internal
Feb 19, 2010. Try using a different OCX. www.comm32.com has a control that mimics mscomm but has many improvements.
一、用MSComm控件通信. Error消息（MSComm控件）下表列出了MSComm控件可 捕获的错误消息：. ComDCBError 8021 检取端口设备控制块时出现内部错误.
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MSComm Serial Error 8021 "Internal error retrieving device control block for the port" Occasionally we get this error when communicating between my motion control.
Occasionally we get this error when communicating between my motion control software and a plasma cutting torch. What the serial link is being used for is a one time.
mscomm_百度百科 – Error消息（MSComm控件）下表列出了MSComm控件可捕获的错误消息：. 常量值 描述. 通信设备读错误. ComDCBError 8021 检取端口设备控制块时出现内部错误.