Programming interface
4.2 Error and status messages
SIMATIC 3964R protocol for Windows 9x/XP/7
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Installation Manual, 01/2013, J31069-D0131-U001-A2-7218
Status error messages
Used by:
• ComReadState
• ComWriteState
These messages signal status errors that occurred during the transfer of frames. They
mostly relate to the interface or local system resources.
Each message can include several individual messages. This is achieved by ORing the
individual error messages. To identify a status error message, however, the
"COM_ST_ERROR" is always set. The following status error messages are possible:
Status error messages
COM_ST_2MANY Too many jobs, send queue full
COM_ST_NO_CON Connection establishment failed (sending)
COM_ST_NO_TRA Frame transfer failed (sending)
COM_ST_2SMALL Receive buffer too small when receiving
COM_ST_BCCERR Block check error while receiving
COM_ST_TIMCON Timeout during connection establishment (sending)
COM_ST_TIMTRA Timeout during a frame (receiving)
COM_ST_TIMQUI Timeout during connection termination (sending)
COM_ST_SCC_BR COM message: Break
COM_ST_SCC_PY COM message: Parity error
COM_ST_SCC_FR COM message: Framing error
COM_ST_SCC_OR COM message: Overrun
COM_ST_SNDRCV Duplex conflict (sending)
COM_ST_SYSERR Unknown system error
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