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COM_RING()

Syntax:     COM_RING(<port>)

Arguments:  <port> denotes on which serial interface RING signal is to
            be tested, COM1: (1) or COM2: (2).

Returns:    A logical value.
            (.T.) corresponds to RING active.     (MSR Bit 6=1)
            (.F.) corresponds to RING inactive.   (MSR Bit 6=0)

Usage:      COM_RING() provides a simple facility to check the RING
            signal of the serial interface within a program.

Note:       Please refer to the COM_MSR(), if the TERI (change
            of edge at the RING signal) information is required.

Library:    CT1.LIB


--------------------------------- Example ------------------------------

Examples:   * Normally modems having the RING signal will
            * indicate an incoming call.  This does not
            * yet mean that a trouble free connection
            * has been established.


            DO WHILE .NOT. COM_RING(1)          && Wait for call
                                                && (ring).
            ENDDO

            ? "Call detected."