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