Programming interface
4.2 Error and status messages
SIMATIC 3964R protocol for Windows 9x/XP/7
Installation Manual, 01/2013, J31069-D0131-U001-A2-7218
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System error messages
Used by:
• ComOpen
• ComRead
• ComWrite
• ComGetNotify
• ComClose
Messages of this class show that function calls have failed and usually mean a serious error
in the system and/or in the configuration settings.
This protocol implementation uses only a subset of the error messages listed in the header
file. All the relevant error messages are listed below:
System error messages
COM_HANDLE_FALSE Transferred handle is invalid
COM_ALREADE_OPEN Interface is already open
COM_DDFINI_ERROR Interface initialization error
COM_NO_MEMORY Not enough memory available
COM_2SMALL Buffer overflow
COM_READ_ERROR Bad receive job
COM_WRITE_ERROR Bad send job
COM_UNKNOWN_EVENT Message parameter invalid
COM_NOT_OPEN Interface is not open
COM_NO_HANDLE No further port can be opened
COM_REGISTRY Error accessing the Windows registry
COM_NO_CONFIG The addressed port is not configured
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