Casio IT-2000W - Manual (Page 119)

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COMSTAT structure
typedef struct tagCOMSTAT { /* cmst */
BYTE status; /* transfer status */
UNIT cbInQue; /* Number of characters in the reception queue */
UNIT cbOutQue; /* Number of characters in the transmission queue */
} COMSTAT;
The COMSTAT structure is used to store information about the communication device.
< Members >
status Indicates the transfer status. This member consists of the following flags.
CSTF_CTSHOLD
Not supported
CSTF_DSRHOLD Not supported.
CSTF_RLSDHOLD Not supported.
CSTF_XOFFHOLD Not supported.
CSTF_XOFFSENT Not supported.
CSTF_EOF Not supported.
CSTF_TXIM Not supported.
cbInQue Indicates the number of characters in the reception buffer.
cbOutQue Indicates the number of characters in the transmission buffer.