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Introduction Serial Communications COM_BREAK() Creates a break on a transmission line COM_CLOSE() Clears the receiving buffer and closes the com port COM_COUNT() Counts the number of characters in the input buffer COM_CRC() Computes a Cyclic Redundancy Check (CRC) for the string COM_CTS() Queries the Clear To Send (CTS) status COM_DCD() Queries the Data Carrier Detect (DCD) status COM_DOSCON() Provides screen output through DOS--ANSI.SYS terminal emulation COM_DSR() Queries the Data Set Ready (DSR) status COM_DTR() Queries/sets the Data Terminal Ready (DTR) status COM_ERRCHR() Defines replacement for a character not received correctly COM_EVENT() Designates which event at the port triggered a key trap COM_FLUSH() Clears the receiving buffer COM_GETIO() Determines the base address of a port COM_GETIRQ() Determines the interrupt request for a port COM_HARD() Turns the hardware handshake (automatic CTS) on/off COM_INIT() Initializes the port parameters COM_KEY() Monitors the port using key traps COM_LSR() Reads the Line Status Register (LSR) COM_MCR() Reads or sets the Modem Control Register (MCR) COM_MSR() Reads the Modem Status Register (MSR) COM_NUM() Gives the number of the highest available serial interface port COM_OPEN() Opens the port and initializes the buffer COM_READ() Reads characters from the receiving buffer COM_REMOTE() Determines the clear character for the receiving buffer COM_RING() Queries the ring line COM_RTS() Queries or sets the Request To Send (RTS) COM_SCOUNT() Counts number of characters in the background sending buffer COM_SEND() Transmits data directly or in the background COM_SETIO() Changes the base address for a port COM_SETIRQ() Changes the interrupt request for a port COM_SFLUSH() Deletes the sending background buffer COM_SKEY() Monitors port using key traps during background transmission COM_SMODE() Determines the current status of a background transmission COM_SOFT() Queries or sets the software handshake (automatic XON/XOFF) COM_SOFT_R() Tests to see if an XOFF character has been received COM_SOFT_S() Tests to see if buffer has automatically sent an XOFF character XMOBLOCK() Generates a block for XMODEM transmission XMOCHECK() Tests a received XMODEM block ZEROINSERT() Inserts a 0-bit after every fifth 1-bit ZEROREMOVE() Removes 0-bits in a file block
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